Can anybody please solve my doubt? R when made to react with 1eq NaNH2 gives a compound S, which on further reaction with an alkyl halide gives T which on oxidation gives acid U only(molecular mass = 74)..... identify R....

'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