No of C=C bond in carbonyl compound

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In summary: C and H In summary, the compound X has a mass composition of carbon (64.3%), hydrogen (7.1%), and oxygen (28.6%). It has the ability to reduce Fehling's solution to CuO and 0.1 mol of X reacts with 4480cm3 of hydrogen gas in the presence of nickel catalyst. The possible structural formula for X is CH2=CH-CHO. This is determined by the ratio of C:H:O being 3:4:1 based on the percent elemental compositions of C and H.
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somecelxis
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Homework Statement




Compound X has the following composition by mass : carbon(64.3%) , 7.1% of hydrogen and oxygen (28.6%) . X reduces Fehling's solution to CuO . Copper( I) oxide .0.1 mol of X react with 4480cm3 of hydrogen gas in the presence of nickel catalyst. What 's the possible structural formula of X ?
there are 2 choices ..
CH2=CH-CHO
CH3-CH=CH-CH=CH-COH

THE ANS IS CH2=CH-CHO ...Why ? can anyone explain on this? thanks in advance!


Homework Equations





The Attempt at a Solution


mol of hydrogen gas = 4480/22400= 0.2 mol

if there's only one C=C bond , then 1 mol of X react with 1 mol of H2 gas ..

But 0.1 mol of X react with 0.2 mol H2 gas , so there are 2 C=C bond in X ... my choice would be CH3-CH=CH-CH=CH-COH ...
but the correct ans is CH2=CH-CHO
 
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  • #2
somecelxis said:
carbon(64.3%) , 7.1% of hydrogen and oxygen (28.6%)

No idea about everything else, but of the two compounds given only one fits.
 
  • #3
Borek said:
No idea about everything else, but of the two compounds given only one fits.

so which one is correct?
 
  • #4
somecelxis said:
so which one is correct?

Have you tried to find the experimental formula from the numbers given? Or even simpler - have you tried to find the percent elemental compositions from the given formulae?
 
  • #5
Borek said:
Have you tried to find the experimental formula from the numbers given? Or even simpler - have you tried to find the percent elemental compositions from the given formulae?

i got ratio of ratio of C:H:O = 3:4:1
using precentage
 

1. How do I determine the number of C=C bonds in a carbonyl compound?

To determine the number of C=C bonds in a carbonyl compound, you can count the number of double bonds between carbon atoms in the molecule. In a carbonyl compound, the carbon atom in the carbonyl group is connected to a double bonded oxygen atom, making it a C=C bond.

2. Are there any exceptions to the rule that a carbonyl compound has one C=C bond?

Yes, there are some exceptions to this rule. For example, in molecules with multiple carbonyl groups, such as dicarbonyl compounds, there may be more than one C=C bond present. Additionally, some molecules may have C=C bonds in rings or other structures, resulting in more than one C=C bond.

3. Can a carbonyl compound have no C=C bonds?

No, a carbonyl compound must have at least one C=C bond in order to be classified as a carbonyl compound. If there are no double bonds between carbon atoms, it would be considered a different type of compound, such as an alcohol or aldehyde.

4. How do the number of C=C bonds affect the properties of a carbonyl compound?

The number of C=C bonds in a carbonyl compound can affect its chemical and physical properties. For example, a molecule with more C=C bonds may have a higher boiling point and greater reactivity due to the presence of more double bonds, which are sites for chemical reactions to occur.

5. Can the number of C=C bonds in a carbonyl compound be altered?

Yes, the number of C=C bonds in a carbonyl compound can be altered through chemical reactions. For example, a carbonyl compound with one C=C bond may undergo a reaction to form a molecule with two C=C bonds. This process is known as functional group transformation and is an important concept in organic chemistry.

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