Which of the following compounds is correctly named without writing a locant for the aldehyde group?
Aethan-1-al
Bethanal
Cethan-2-al
D1-ethanal
Answer & Solution
Correct answer: B. ethanal
An aldehyde group $(-CHO)$ is terminal, so in a simple open-chain aldehyde its position is inherently at the end of the chain and no locant is needed. Therefore, ethanal is correct; forms like ethan-1-al are unnecessary and nonstandard here.
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