Help with structural formula and resonance structure

[SamTsui86]

I don't know what I am doing wrong, please help.

2) How many different structual formulas can be written for C6H14


Include straight chain and branched chain compounds.


Enter an integer as an answer.

(I put in 5 but it say that I am wrong)



3) Which of the following compounds do not require resonance structures to provide a reasonable description ?




a) OF2


b) N3-


c) NH3O


d) IF5


e) C2H6O


(I've tried ade, de, ae and cde. They're all wrong)

Thank You

 

[siddharth]

Can you explain why you chose the answers like that? That way, it'll be easier to help you correct your mistake.

 

[Blueshift5]

I am happy to assist with your questions about structural formulas and resonance structures. Let's start with the first question about C6H14. This molecule is a hydrocarbon, meaning it is made up of only carbon and hydrogen atoms. Since the formula indicates 6 carbon atoms, we can assume that it is a hexane molecule. Hexane can exist in different isomeric forms, meaning it has the same chemical formula but a different arrangement of atoms. In this case, there are three possible isomers for C6H14: n-hexane (straight chain), 2-methylpentane (branched chain), and 3-methylpentane (branched chain). Therefore, the correct answer is 3 different structural formulas for C6H14.

Moving on to the second question, let's look at the compounds that require resonance structures. Resonance structures are needed when a molecule or ion cannot be accurately described by a single Lewis structure. In this case, only N3- (azide ion) requires resonance structures to accurately depict its bonding. The correct answer is b) N3-.

I hope this helps clarify your understanding of structural formulas and resonance structures. If you have any further questions, please do not hesitate to ask. Keep up the good work!