JEE Previous Year Question

Consider all possible isomeric ketones, including stereoisomers of MW = 100. All these isomers are idependently reacted with NaBH4

Topic: JEE PYQ

Answer: 5. Full step-by-step solution below.

Correct answer: 5

Solution

5
Sol. CnH2nO, MW = 12n + 2n + 16 = 100 ∴ 14n = 84 ∴ n = 6
Six such ketones exist :
C6H12O


(+) & (–) (+) & (–) (+) & (–) (+) & (–) diastere. (+) & (–) diaste.
Thus, 5 such ketones give a racemic mixture

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