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Q.

Assertion (A): Reaction of But-2-yne with Na/liqNH3 gives trans But-2-ene
Reason (R ) : By using Na/liqNH3  addition of hydrogens occur from same side(syn)of triple bond

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a

A is false but R is true

b

A is true but R is false

c

Both A and R are true R is not the correct explanation of A

d

Both A and R are true R is the correct explanation of A

answer is C.

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Detailed Solution

Na in liq.ammonia trans alkene is formed by anti addition 

What does the reduction of alkynes with sodium in liquid ammonia give? - Quora
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