The hydrocarbon which can react with sodium in liquid ammonia is

(1) CH3CH2C ≡ CCH2CH3

(2) CH3CH2CH2C ≡ CCH2CH2CH3

(3) CH3CH2C ≡ CH

(4) CH3CH ≡ CHCH3

'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