Question

When treated with ammoniacal cuprous chloride, which one among the following forms copper derivative?

• A. $C_2{H}_6$
• B. $C_2{H}_4$
• C. $C_2{H}_2$
• D. $C_6{H}_6$

Answer 1

The correct option is C $C_2{H}_2$

Acetylene $\left(C_2{H}_2\right)$ reacts with ammoniacal solution of cuprous chloride $\left[Cu\right(N{H}_3{)}_2{]}^{+}O{H}^{-}$ to produce dicopper acetylide
(red ppt) where as ethylene does not give reaction.
$CH\equiv CH+2\left[Cu\right(N{H}_3{)}_2{]}^{+}O{H}^{-}\to \stackrel{+}{C}u\stackrel{-}{C}\equiv C^{-}C{u}^{+}+2H_{2}O+4N{H}_3\text{red ppt}$
Hence correct option is c.