which of the foll. will have a mesoisomer also?

a)2,3 dichloropentane

b)2,3 dichlorobutane

c)2-chlorobutane

d)2-hydroxyprpanoic acid

'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