Question

Single chemical test to distinguish between 1 butyne and 2 butyne

Answer 1

Answer:

Hey dear,

● Answer -

Reaction with ammoniacal Cu2Cl2 solution

● Explaination -

- As terminal hydrogen in 1-butyne is acidic, it reacts with ammoniacal Cu2Cl2 to give red ppt of copper-1-butynide.

2CH3-C≡CH + Cu2Cl2 ---> 2CH3-C≡CCu + 2HCl

- 2-butyne due to absence of terminal acidic hydrogen, doesnt give this ppt.

# Alternative tests -

- NaNH2 test

- Ammoniacal AgNO3 test

Hope this helps you...

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