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JEE Main levelOne or more correct optionsDifficulty 2 of 3hc120

Which of the following reagents react with pent-1-yne but NOT with pent-2-yne?

Aammoniacal $AgNO X_{3}$ , giving a white precipitate
B $H X_{2}$ with Pd/ $BaSO X_{4}$ and quinoline, giving an alkene
C $NaNH X_{2}$ in liquid ammonia, giving a sodium salt
D $Br X_{2}$ in $CCl X_{4}$ , with decolourisation

Answer: A, C

Only a terminal alkyne has an acidic

sp

C-H, so it alone forms the sodium salt and the silver salt. Both alkynes add bromine and both are partially hydrogenated by the poisoned catalyst, since these use the

C \equiv C

pi bonds.

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