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# When a carbon atom is linked to four different groups it is said to be chiral carbon atom. when alpha hydrogen atom of an alkane is replaced by a functional group we get corresponding compound. Lowest molecular mass optically active ketone contians ____ carbon atoms?

$(a)\;5 \\ (b) \; 6 \\ (c) \; 8 \\ (d)\;7$

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A)
6 is the correct answer.
Hence b is the correct answer.