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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?

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

Toolbox:
• An alpha (symbol: α) hydrogen is a hydrogen atom on an alpha carbon in an organic molecule; a hydrogen atom on a beta carbon is a beta hydrogen, and so on (α, ß, γ, δ…).
• A compound capable of optical rotation is said to be optically active. All pure chiral compounds are optically active.
• A chiral molecule is a molecule that is not superimposable on its mirror image.
The lowest molecular mass optically active ketone is
$\therefore$ 6 is the correct answer.
Hence b is the correct answer.
edited Mar 29, 2014