The reaction of 4-Bromo benzyl chloride with sodium cyanide in ethanol leads to the formation of ?

The answer is not 2,4 bromophenyl acetonitriyl as said by Mr.Umakant Biswal when I had asked the question previously.

'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