Acetylene reacts with a $42\% H_2SO_4$ solution containing $1\% HgSO_4$ to give

Choose the sequence of steps that describes the best synthesis of but$-1$-ene from ethanol.

Which is represented by the formula $C_n H_{2n - 2}$?

$\underset{(\text{Calcium carbide})}{CaC_2}$ $\xrightarrow{H_2O} (A)$ $\xrightarrow{\text{Red hot Cu tube}} (B)$. The product $(B)$ of the reaction is:

Which reactant is used to prepare trans alkene from alkyne?

$HC \equiv CH$ $\xrightarrow[{excess}]{{CH_3MgBr}} \mathop {(A)}\limits_{\text{salt}} + \mathop {(B)}\limits_{\text{hydrocarbon}}$
$(A)$ $\xrightarrow[{excess}]{{CH_3I}} (C)$ $\xrightarrow[{(ii) H^{+} }]{{(i) NaNH_2}} (D)$