Which one of the following structures represents n-butyl methanoate?Question 6Answera.CH3CH2CH2COOCH3b.CH3COOCH2CH2CH2CH3c.HOOCCH2CH2CH2CH3d.CH3CH2CH2CH2COOCH3
Question
Which one of the following structures represents n-butyl methanoate?
Question 6
Answer
a. CH3CH2CH2COOCH3
b. CH3COOCH2CH2CH2CH3
c. HOOCCH2CH2CH2CH3
d. CH3CH2CH2CH2COOCH3
Solution
The correct answer is:
b. CH3COOCH2CH2CH2CH3
Here's why:
n-Butyl methanoate is an ester. The general structure of an ester is R-COO-R'. The 'R' part is derived from the carboxylic acid (in this case methanoic acid, which is HCOOH) and the 'R'' part is derived from the alcohol (in this case n-butanol, which is CH3CH2CH2CH2OH).
a. CH3CH2CH2COOCH3 - This is not n-butyl methanoate because the 'R' part is propyl (CH3CH2CH2-) and the 'R'' part is methyl (CH3-), which would make it methyl propanoate.
b. CH3COOCH2CH2CH2CH3 - This is n-butyl methanoate because the 'R' part is methyl (CH3-) from methanoic acid and the 'R'' part is butyl (CH3CH2CH2CH2-) from n-butanol.
c. HOOCCH2CH2CH2CH3 - This is not an ester, it's a carboxylic acid.
d. CH3CH2CH2CH2COOCH3 - This is not n-butyl methanoate because the 'R' part is butyl (CH3CH2CH2CH2-) and the 'R'' part is methyl (CH3-), which would make it methyl butanoate.
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