The ketone shown is stirred with excess $D X_{2} O$ containing a catalytic amount of NaOD until no further exchange occurs. How many hydrogen atoms per molecule are replaced by deuterium?

Answer: A

The drawn compound is 4-methylpentan-2-one. Only alpha-hydrogens exchange: the CH3 (3 H) and the CH2 (2 H) give 5 (RDKit alpha-H count 5). The isopropyl CH is beta and the two terminal CH3 groups are gamma, so they do not exchange.

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The ketone shown is stirred with excess DX2​O containing a catalytic amount of NaOD until no further exchange occurs. How many hydrogen atoms per molecule are replaced by deuterium?

Answer: A

More questions on Alpha hydrogens, enolisable positions and haloform test on drawn compounds

The ketone shown is stirred with excess $D X_{2} O$ containing a catalytic amount of NaOD until no further exchange occurs. How many hydrogen atoms per molecule are replaced by deuterium?