The optically inactive compound from the following is

(a) 2-chloropropanal

(b) 2-chloropentane

(c) 2-chlorobutane

(d) 2-chloro-2-methylbutane.

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane