Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?

Question

Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne? (A) NaNH2 (B) HCl (C) O2 (D) Br2

Tardigrade Admin · Accepted Answer

1 - Butyne reacts with NaNH 2 to give sodium salt while 2 - butyne does not react. Only terminal alkynes are acidic. CH 3- CH 2- C ≡ C - H xrightarrow+ NaNH 2 1- Butyne NH 3+ CH 3- CH 2- C ≡ C c - Na ⊕+ NH 3

Q. Which of the following reagents will be able to distinguish between $1$ -butyne and $2$ -butyne?

$N a N H_{2}$

$H Cl$

$O_{2}$

$B r_{2}$

$1 -$ Butyne reacts with $N a N H_{2}$ to give sodium salt while $2$ - butyne does not react. Only terminal alkynes are acidic.
$C H_{3} - C H_{2} - C \equiv C - H + N a N H_{2}$
$1 -$ Butyne
$N H_{3} + C H_{3} - C H_{2} - C \equiv C^{c -} N a^{\oplus} + N H_{3}$

Q. Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?

NaNH2​

HCl

O2​

Br2​