Question

The distinguishing test for triple bond containing acidic hydrogen is

• A. $\left[Cu\right(N{H}_3{)}_2{]}^{+}O{H}^{-}$
• B. $B{r}_2$ in $CC{l}_4$
• C. Alkaline $KMn{O}_4$
• D. $AlC{l}_3$

Answer 1

The correct option is A $\left[Cu\right(N{H}_3{)}_2{]}^{+}O{H}^{-}$

The terminal alkynes (has acidic hydrogen) react with ammoniacal solution of cuprous chloride $\left[Cu\right(N{H}_3{)}_2{]}^{+}O{H}^{-}$ to give a red precipitate.