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JEE Main levelSingle correct optionDifficulty 2 of 3si205

Ethanal is treated with dilute NaOH in the cold to give A. A is heated to give B. B is hydrogenated with excess $H X_{2} / Ni$ to give C. C is

Abutanal
Bbutan-1-ol
Cbut-2-en-1-ol
Dbutan-2-ol

Answer: B

Aldol addition gives 3-hydroxybutanal (A), which on heating dehydrates to but-2-enal (B). Excess

H X_{2} / Ni

reduces both the C=C and the C=O, giving

CH X_{3} CH X_{2} CH X_{2} CH X_{2} OH

, butan-1-ol.

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