Question

Convert Ethyne to But-2-yne.

Answer 1

C2H2 + CH2 gives C3H4.
C2H2 is ethyne and
C3H4 is butyne

Answer 2

Answer :

The preparation of higher alkynes from the lower alkynes :

This reaction involves two steps :

Step 1 : When the terminal ethyne react with the sodamide to give acetylides.

Step 2 : When acetylides react with haloalkane (ethylchloride) to give but-1-yne as higher alkynes.

The given reaction conversion are shown below.