Which rotation only when substituted by deuterium isomerism?

(a) l-Phenyl – 2 – butane

(b) 3- Phenyl – l – butane

(c) 2 – Phenyl – l – butane

(d) l,l – Diphenyl-l- propene

'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