Question

how to convert ethyne to propyne

Answer 1

$HC = CH +NaN H_{2} (liquidN H_{3} 196k) -\ \textgreater \ HC = C^{-} N a^{+} + N H_{3}$

$HC = C^{-} N a^{+} + C H_{3} Br -\ \textgreater \ HC = C - C H_{3} + NaBr$