First slide

Alkynes

Question

In which of the following reactions(s), an alkyne product is formed ?

Moderate

A

${Al}_{4} C_{3} + H_{2} O ⟶$
B

${CaC}_{2} + H_{2} O ⟶$
C

${Mg}_{2} C_{3} + H_{2} O ⟶$
D

Solution

${CaC}_{2} + H_{2} O ⟶ H - C \equiv C - H + Ca (OH)_{2}$
${Mg}_{2} C_{3} + H_{2} O ⟶ Mg (OH)_{2} + {CH}_{3} - C \equiv CH$
${Al}_{4} C_{3} is methanide, gives methane on hydrolysis.$

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