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JEE Main levelSingle correct optionDifficulty 2 of 3nm094

Which of the following is methyl 2-methylpropanoate?

A $(CH X_{3}) X_{2} CH - COO - CH X_{3}$
B $(CH X_{3}) X_{2} CH - CH X_{2} - COO - CH X_{3}$
C $HCOO - CH X_{2} - CH (CH X_{3}) X_{2}$
D $CH X_{3} CH X_{2} CH X_{2} - COO - CH X_{3}$

Answer: A

The acid part is 2-methylpropanoic acid,

(CH X_{3}) X_{2} CH - COOH

, and the alkyl word methyl is on the ester oxygen. This gives

(CH X_{3}) X_{2} CH - COO - CH X_{3}

. The others are methyl butanoate, 2-methylpropyl methanoate and methyl 3-methylbutanoate.

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