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Which of the followig reagents may be us...

Which of the followig reagents may be used to distinguish between but-1-yne and but-2-yne?

A

Ammoniacal CuCl

B

Conc. `H_2SO_4`

C

`Br_2` in `C Cl_4`

D

Dilute `KMnO_4`

Text Solution

Verified by Experts

The correct Answer is:
A
Both alkynes dissolve in conc. `H_2SO_4` and discharge the color of `Br_2` as well as `KMnO_4` However, only but-1-yne having acidic H atom gives red precipitate of copper alkynide:
`CH_3CH_2C-=CHoverset(Cu^(+))tounderset("red ppt")(CH_3CH_2C)-=CCu(s)`
`CH_3C-=C CH_3overset(Cu^(+))to` No reaction
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