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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3co005

Which of the following statements about nucleophilic addition to carbonyl compounds are correct?

A4-nitrobenzaldehyde is more reactive than benzaldehyde
B $CH X_{3} COCH X_{3}$ is more reactive than $(CH X_{3}) X_{3} CCOC (CH X_{3}) X_{3}$
Cbenzaldehyde is more reactive than ethanal
D $HCHO$ is more reactive than $CH X_{3} CHO$

Answer: A, B, D

Steric and inductive effects explain the first two, and the nitro group raises electrophilicity in the third. In benzaldehyde, resonance with the ring lowers the positive charge on carbon, so it is less reactive than ethanal.

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