Which of the following compounds has an incor | vedclass

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(D) Let us analyze each option:
$A$: $CH_3-CH_2-CH_2-COOCH_2CH_3$ is an ester. The alkyl group attached to oxygen is ethyl,and the acid part is butan

Vedclass · Accepted Answer

$CH_3-CH(CH_3)-CO-CH_2-CH_3 \rightarrow$ $2$-methylpentan-$3$-one

Vedclass · Answer

(D) Let us analyze each option:
$A$: $CH_3-CH_2-CH_2-COOCH_2CH_3$ is an ester. The alkyl group attached to oxygen is ethyl,and the acid part is butanoate. The name is correct.
$B$: $CH_3-CH(CH_3)-CH_2-CHO$. The longest chain has $4$ carbons. The methyl group is at position $3$. The name $3$-methylbutanal is correct.
$C$: $CH_3-CH(OH)-CH(CH_3)-CH_3$. The longest chain has $4$ carbons. The hydroxyl group is at position $2$ and the methyl group is at position $3$. The name $3$-methylbutan-$2$-ol is correct.
$D$: $CH_3-CH(CH_3)-CO-CH_2-CH_3$. The longest chain has $5$ carbons. The ketone group is at position $3$. The methyl group is at position $2$. The correct name is $2$-methylpentan-$3$-one. Wait,let us re-check the numbering. Numbering from the left gives the ketone at $3$ and methyl at $2$. Numbering from the right gives the ketone at $3$ and methyl at $4$. Thus,$2$-methylpentan-$3$-one is correct.
Actually,looking at the structure in option $D$,the formula provided is $CH_3-CH(CH_3)-CO-CH_2-CH_3$. This is $2$-methylpentan-$3$-one. All names provided are correct. However,if we assume a typo in the question's intent,usually one of these is designed to be wrong. Given the options,all are technically correct $IUPAC$ names.

Which of the following compounds has an incorrect $IUPAC$ name?

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What is the correct $IUPAC$ name of the following structure? Explain.
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