Question

Ethyne is not prepared by:

• A. heating iodoform with $Ag$ powder
• B. hydrolysis of calcium carbide
• C. heating $C_2{H}_{2}C{l}_4$ with zinc dust
• D. heating iodoform with $Na$

Answer 1

The correct option is D heating iodoform with $Na$

In all the given reactions Acetylene or ethylene is formed except heating Idoform with Na. As iodoform doesn't even reacts with $Na$ so this will not produce alkyne.
Option D is correct.