What is Organic: Definition and 446 Discussions

Organic chemistry is a branch of chemistry that studies the structure, properties and reactions of organic compounds, which contain carbon in covalent bonding. Study of structure determines their chemical composition and formula. Study of properties includes physical and chemical properties, and evaluation of chemical reactivity to understand their behavior. The study of organic reactions includes the chemical synthesis of natural products, drugs, and polymers, and study of individual organic molecules in the laboratory and via theoretical (in silico) study.
The range of chemicals studied in organic chemistry includes hydrocarbons (compounds containing only carbon and hydrogen) as well as compounds based on carbon, but also containing other elements, especially oxygen, nitrogen, sulfur, phosphorus (included in many biochemicals) and the halogens. Organometallic chemistry is the study of compounds containing carbon–metal bonds.
In addition, contemporary research focuses on organic chemistry involving other organometallics including the lanthanides, but especially the transition metals zinc, copper, palladium, nickel, cobalt, titanium and chromium.

Organic compounds form the basis of all earthly life and constitute the majority of known chemicals. The bonding patterns of carbon, with its valence of four—formal single, double, and triple bonds, plus structures with delocalized electrons—make the array of organic compounds structurally diverse, and their range of applications enormous. They form the basis of, or are constituents of, many commercial products including pharmaceuticals; petrochemicals and agrichemicals, and products made from them including lubricants, solvents; plastics; fuels and explosives. The study of organic chemistry overlaps organometallic chemistry and biochemistry, but also with medicinal chemistry, polymer chemistry, and materials science.

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  1. vishnu.mec

    Order of acidity in organic compounds

    HI! I want to know the order ofacidity of p-nitro phenol, acetic acid, picric acid and formic acid. Please help quickly. Thanks...
  2. D

    Organic Chemistry: No. of chiral centres in Camphor

    Hello. I have a query regarding organic chemistry. 1. http://tinyurl.com/y9nvg2p See question number 21. 2. Homework Equations : None 3. The first Carbon atom beneath the top-most CH3 group I can tell is a chiral centre, as it has 4 different groups attached to it (C=O, CH2...
  3. E

    Organic chemistry concept help

    Why does delocalization of the negative charge over the ortho and para positions of aromatic rings increase the stability of the phenoxide anion? Why do the ortho and para positions increase the stability but not the meta position? Please explain. Thank you.
  4. E

    Does Dehydration of 1-Butanol Typically Yield 2-Butene or 1-Butene?

    If you dehyrate 1-butanol, wouldn't you get 2-butene due to rearrangement? This is not a homework question. This is an mcat review question. The question asks: when 1-butanol is dehydrated, the new compound's heat of hydrogenation is most likely? The answer is between 30 and 33 kcal/mol It...
  5. C

    Organic Chemistry Multistep Synthesis

    Homework Statement http://i.imgur.com/H8p56.jpg 2. The attempt at a solution I'm not quite sure how to start this one... I would assume organolithiation could get me started for the two combining, but I'm not quite sure how to get the 3' carbon to spout that ehtyl group or how to...
  6. W

    Organic Chem - Identifying Functional Groups

    Homework Statement Hi all, i have to identify 5 samples (1,2,3 were solids, 4,5 were liquids) by classifying them as 1) Aliphatic or aromatic and 2) Carboxylic acid, amine (primary, secondary, tertiary) or ammonium carboxylate We did a burn test on the solids, tested solubility in water...
  7. P

    What Does 2-Butanol Form with Trifluoroacetic Anhydride?

    Homework Statement What would be the product of the reaction between trifluoroacetic anhydride and 2 butanol. This is a secondary alcohol. When a primary alcohol like methanol reacts with trifluoroacetic anhydride it forms methyl trifluoroacetate, but what 2 butanol form with it? I tried and...
  8. S

    Gas Chromatography - Organic Chemistry

    Why do ten molecules of toluene that enter a GC column at exactly the same time not reach the detector at the same time? Why are London Dispersion forces of the sample molecules strongly influencing GC measurements? And why are they negligible in TLC experiments on silica gel? I have no...
  9. K

    Organic Compounds Structural Formula

    when drawing the structural formula for 2-methylbutane or 2,3-dichloro-2-methylbutane,does it matter which end of the chain i begin counting from?
  10. L

    Gas cycle, rankine cycle, organic rankine cycle, kalina cycle, and all that

    (maybe it fits better in this forum) Hello, I have been asked an advice about waste heat to power systems (say wh2p). The available waste heat to be considered is a (dirty) gas in a temperature range between 250°C and 450°C. The useful power that could be generated would range between...
  11. L

    Gas cycle, rankine cycle, organic rankine cycle, kalina cycle, and all that

    Hello, I have been asked an advice about waste heat to power systems (say wh2p). The available waste heat to be considered is a (dirty) gas in a temperature range between 250°C and 450°C. The useful power that could be generated would range between 2MW and 10MW. I know some examples...
  12. J

    A concept problem on organic chemistry

    Alkanes are saturated hydrocarbons which are very unreactive. However, they undergo combustion, i.e. they react with oxygen. Why? (Even compounds as unreactive as polythene with over thousands of carbon atoms per molecule undergoes combustion...)
  13. B

    The relative difficulty of organic chemistry

    There is lots of talk about how hard Organic Chemistry is, so I ask, what did you think of Organic Chemistry if you took it, and how did you excel at it if you did? What were your weaknesses?
  14. N

    Answer: Name Organic Compound: "Pun" Benzene Ring

    This is for a friend: The worksheet says: Name the following comounds: It has a picture, which is a benzene ring with 2 PhD groups off the 1 and 2 positions. Is also says "THis one is a pun. See if you can figure it out!" Thanks, nkk
  15. G

    Organic matter in absolute zero?

    For example, what happens if you put an apple in space? Or what happens when animals (or people) are frozen to very low temperatures?
  16. C

    How Do I Determine (S) vs. (R) Configuration in Cyclopentanediol?

    Homework Statement A question on a pretest asks me to name this. I know it's either (1R,2R) or (1S,2S)1,2-Cyclopentanediol because the OH's are facing in opposite directions, but I'm not sure how to figure out if the OH's are S or R 2. The attempt at a solution I somewhat have an...
  17. P

    Oxidation of Organic Chemicals

    In the oxidation of organic chemicals, are there any conditions that must involve water or must not be in the presence of water or the oxidation process will stop despite the presence of the oxidizing agent? I remember my teacher saying something about this, but I don't remember which one it is...
  18. C

    Organic Chem [Napthalene and benzoic acid]

    Hi guys, I've got a question which i couldn't solve. Both napthalene (two benzene ring join together) and benzoic acid are aromatic compounds which exist as white solids. Based on their physical ahd chemical properties, describe how you could separate the components of a mixture of these...
  19. F

    Is there a point to buying organic?

    Over the past month, with the approaching date of the Copenhagen summit, several news and scientific articles have been prominently dedicated to various environmental issues, namely organic farming, the sustainability of keeping high levels of meat in our diets and its growth in developing...
  20. M

    Identifying and Separating Metal Chloride and Organic Substance in Project 7

    Homework Statement Project 7: Identification and Separation of a Metal Chloride and an Organic Substance Here is an open ended lab we have to do for general chemistry: A chemical manufacturing company which produces a variety of specialty chemicals has come across an old waste jar...
  21. S

    Is organic chemistry 1 AND 2 all memorization?

    i know this is a physics forum, but i figure you guys might like chemistry too? and i know you guys probably took up to orgo to get your physics degrees. anyways over the summer session assuming i pass my current classes and my classes in the spring, i will be taking orgo 1, orgo 2, and...
  22. S

    Trouble Identifying this Organic Unknown

    Alright, I've got a bunch of physical data and an IR Spectrum, but somehow it doesn't seem to match up with any compound I find through google. Even worse, I have a list of compounds it should be and there's still no obvious winner. Any help is dearly appreciated. Clear, yellowish liquid...
  23. C

    Chemistry Chemistry - Trying to name aromatic compounds and organic chemistry molecules

    Im trying to name the following molecules 1- CH3-CH2-CH-CH2-CH-CH2-CH2-CH3 l l CH3 CH2 l CH3 2- CH3-CH2-CH-CH2-CH-CH3 l l CH2 CH2...
  24. H

    How Can We Predict Catalysts and Conditions for Organic Reactions?

    !Organic chemistry reaction I just wonder is there any ways to predict the catalyst and other conditions for a certain organic reaction to happen?
  25. O

    Organic Chemistry Geometric Isomers Lab

    Homework Statement The experiment was changing dimethyl maleate into dimethyl fumerate, with the intent of being analogous to changing maleic acid into fumeric acid. In the experiment, we added 1 M Bromine in dimethylchlorine to our dimethyl fumerate, put the mixture in a hot water bath and...
  26. I

    How do I name a cycloheptane with three substituents using organic nomenclature?

    Homework Statement Hello all. Im not sure how to get the image of the organic compound i need to name on here, but I think I can do a good job of describing it. The compound I need to name is a cycloheptane with three substituents on it. These substituents are bonded to three consecutive...
  27. O

    Organic Chemistry Reactions - Check my Answers, Please

    Organic Chemistry Reactions - Check my Answers, Please! :) this is the lab that we have to do in class: http://academics.eckerd.edu/instructor/grove/gorgchem/Extraction%20Lab.pdf http://picasaweb.google.com/lh/photo/cnIZmcws9cN3v_1TDx7nfg?authkey=Gv1sRgCI-xv4Hl9tampgE&feat=directlink
  28. A

    Organic Chemistry: Advice for Struggling Students

    Hi, I'm going to be taking O chem this quarter in college. I took a year of general chemistry last year, but didn't do so well in the first two out of three quarters. Now I think that I don't remember anything from general chemistry. what do i do?
  29. G

    Organic Chemistry(functional group)

    I have Been wondering a lot that why we cannot separate the organic compounds from the functional groups. And this is not established by the inorganic compounds! What looks strange to me even more is that whenever a reaction occurs we face the functional group and these functional group are...
  30. W

    What Is the Major Resonance Contributor of This Organic Molecule?

    can someone help me with this question? Draw the most important resonance contributor of the following structure? if its to small http://img196.imageshack.us/img196/8417/48084902.jpg
  31. S

    Identifying unknown organic compounds

    Homework Statement A chemist has three liquids (Ethanol, butanoic acid and 3-heptyne) labelled P,Q,R (in no specific order). When drops of bromine solution were added to samples of each liquid, P and Q decolorised the bromine, but R did not. When drops of sodium carbonate solution were added...
  32. L

    Organic Chem: Diels-Alder w/ Anthracene & Maleic Anhydride

    In the Diels-Alder reaction between anthracene and maleic anhydride, why is it carried out in xylenes rather than in ethanol?
  33. P

    Cis and Trans Isomers of 2-Butene

    Homework Statement CH3CH=CHCH3 What's the cis and trans structure name for this formula? Homework Equations The Attempt at a Solution I've drew the ciis and trans structure H\ /H C = C / \ CH3 CH3 this is the cis the tran is similar to...
  34. D

    Organic Chemistry stable conformation question

    1. In the chair conformation, why would 1-bromo-tetrahydropyran be more stable in the axial position, as opposed to the equitorial position? (Hint: consider how the bromo group affects the attached carbon and what the oxygen could do to alleviate that.) 2. No relevant equations 3...
  35. S

    What Is the Dominant Product When an Alkene Reacts with H2 and Pt?

    Homework Statement An alkene H---C=C---F ____|_| ___Cl__I reacts with H2 in the presence of Pt. What will the dominant product be? Homework Equations See below. The Attempt at a Solution Syn addition will occur, so the hydrogen atoms will either be in the front or...
  36. T

    Organic Reaction Mechanisms: Memorizing vs. Computing

    Hi, I'm in first year organic chem and we're obviously learning about all the different reaction mechanisms (e.g. elim reactions of alcohols) and I was wondering if the only way to figure out what is going to happen in a particular reaction is to memorize all these different reaction...
  37. L

    Organic Chemistry - why not just three 2p orbitals in ethene?

    After promoting one of the electrons in the 2s orbital, the 2s orbital and two of the 2p orbitals undergo hybridization to form three sp2 orbitals, leaving the other 2p orbital unhybridized. But why is the hybridization necessary? Isn't the three 2p orbitals sufficient to form three identical...
  38. T

    Organic Mystery Goo Off Alaskan Coast

    http://www.telegraph.co.uk/earth/earthnews/5835975/Arctic-sea-full-of-huge-blobs-of-floating-goo.html http://www.adn.com/2835/story/864687.html Anyone else heard about this yet? Are we under attack from some alien life form? :o Any theories as to what could explain this? Edit...
  39. O

    Distribution coefficient problem for Organic Chem

    Homework Statement When 100 mL of an aqueous solution containing 1.0 g of caffeine is extracted with 10 mL of chloroform at room temperature, 0.5 g of caffeine is transferred to the chloroform layer. Calculate the distribution coefficient of caffeine between chloroform and water at room...
  40. A

    Why Is My Calculated Molar Mass of Phthalic Acid Different from My Peers'?

    Homework Statement We did an experiment in lab today where we were given a compound and we had to figure out the chemical formula and molar mass using titration (titrated with NaOH). The compound I got was phthalic acid, and the average molar mass I got was ~135g. This is about 30 grams off of...
  41. A

    What is the difference in toxicity between thimerosal and straight mercury?

    So what is the difference between thimerosal and straight mercury? Is it more or less harmful?
  42. T

    Organic Halide Reaction: Products of Chloroethane and Sodium Hydroxide

    Homework Statement When reacting chloroethane with sodium hydroxide, what are the products? The Attempt at a Solution I think there are two possible solutions to this problem. One possible solution is ethanol and sodium chloride, through a substitution reaction. Another solution could...
  43. P

    Organic Chemistry is the study of what

    Homework Statement Modern organic chemistry is the study of: a) only molecular compounds b) only petrochemicals c) only natural molecules d) molecules of carbon The Attempt at a Solution I think the answer is c) because organic chemistry looks at molecules of (dead) plants...
  44. M

    Can Degree of Freedom and Phase Rule be Applied to Organic Reactions?

    can degree of freedom and phase rule be applied to organic reactions,is it possible to degree of freedom above 3?
  45. H

    What are the links between organic chemistry and biochemistry

    and why is biochemistry important in medicine? I kind of know why, but i can't find that much information so I am stuck and i need a bit of help if anyone could help me? Ive read that organic chemistry serves as a basis of biochemistry and biochemistry is the study of chemical processes in...
  46. X

    Organic Synthesis: Reduction of ketone to alcohol

    Hi. I was to plan and conduct the reduction of 4-t-butylcyclohexanone into 4-t-butylcyclohexanol using NaBH4 as reducing agent, MeOH as solvent, and NH4Cl. My question is about the use of NH4Cl. How does it act as a quenching agent? I've figured out that it acts as a quenching agent by removing...
  47. T

    Organic Chemistry: Reactivity levels

    This is a general Organic Chemistry question. How do the reactivities of the following compare? Acyl Chlorides, Esters, Anhydrides, Amides, Ketones, Aldehydes The Attempt at a Solution I know the following "ladder:" MOST REACTIVE acyl chloride anhydride ester amide LEAST...
  48. D

    Organic Chemistry Mechanism Question

    Homework Statement I am given isobutane as my starting material, Br2 and benzoyl peroxide as my radical initiators. My final product is the isobutane with Br attached instead of H. I have to design the mechanism. I have tried what seems like an endless combination of mechanism attempts...
  49. ~christina~

    Evaporation of organic solvent and leftover residue

    I have a question about evaporation of organic solvents and the leftover sample after this is done. (sample dissolved in the organic solvent) Does the sample, leftover after the evaporation of a organic solvent, (used to dissolve the sample) affect the analysis of the dry sample? (basically...
  50. R

    Organic Nomenclature - Benzenes

    http://chemistry.boisestate.edu/people/richardbanks/organic/nomenclature/aromatic3.gif is called o-methylethylbenzene, why isn't it instead called o-ethylmethylbenzene? I thought it was alphabetical
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