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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3co107

Which compounds contain exactly four alpha-hydrogen atoms? (One or more answers)

Acyclopentanone
Bpentan-3-one
Cbutan-2-one
D2-methylpropanal

Answer: A, B

Cyclopentanone has two alpha

CH X_{2}

groups: 4 H. Pentan-3-one,

CH X_{3} CH X_{2} COCH X_{2} CH X_{3}

, has two alpha

CH X_{2}

groups: 4 H. Butan-2-one has

CH X_{3}

plus

CH X_{2}

:

3 + 2 = 5

H. 2-Methylpropanal has only one alpha-H on the CH carbon.

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