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Question

Hydrocabon (A) C4H6 gives white ppt. with Tollens' reagent. 
(A)i. NaNH2, liq. NH3−−−−−−−−−−−ii. CH3I(B)Na−−−−liq. NH3(C)

(A)i. Hg(OAc)2,H2O−−−−−−−−−ii. NaBH4(S)NaBH4−−−(T)

Which of the following is/are true regarding given reaction sequences?


A
(C) is trans isomer
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B
(C) is cis-isomer
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C
(T) is a pair of enantiomer
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D
(T) is single product
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Solution

The correct options are
A (C) is trans isomer
C (T) is a pair of enantiomer

Alkynes reduce to trans alkene with use of sodium in liquid ammonia. Hence (C) obtained is trans isomer.
(T) has chiral centre so it exists in enantiomeric pair.

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