Question

For preparing prop-1-yne in kolbe electrolysis we take

• A.
• B.
• C.
• D. All of these

Answer 1

The correct option is A

Kolbe's electrolysis is a preparation method for alkynes. Here, the alkene dicarboxylate potassium/sodium salts are electrolysed in water to give respective alkynes. During electrolysis the carboxylate group breaks and remove as $C{O}_2$ leaving free radicals. Then the radicals combine to form the alkyne compounds. The potassium ions in solution combine with $O{H}^{-}$ to give KOH. Thus, the solution left after electrolysis is basic in nature.

Compound (a) on electrolysis gives prop-1-yne.

Compound (b) on electrolysis gives acetylene
Compound (c) on electrolysis gives But-1-yne.

Thus the correct answer is (a).