1.

Acetylene `underset(NH_4Cl)overset(CuCl)to` The product formed in the reaction isA. buta-1,3-diyneB. butenyneC. buta-1,3-dieneD. but-2-yne

Answer» Correct Answer - B
With CuCl under mild acidic condition `(NH_4^(+))`, acetylene adds to itself (couples) to form the dimer,
`H_2C=CH-C-=CH`, butenyne or vinylacetylene,
Under basic conditions `(NH_3)`, copper acetylide is formed.
`HC-=CHoverset(Cu(NH_3)_2^(+)overline(O)H)toCu-C-=C-Cu+NH_3+H_2O`


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