$$ \text { Identify ' } A \text { ' in the following reaction. } $$

A $\xrightarrow{\text { Lithium amide }}$ Ethynyl lithium $\xrightarrow{\text { Bromoethane }}$ But - 1 - yne

When 2-methylbut-2-ene is treated with hydrogen chloride, the major product formed is

Which of the following is NOT obtained when mixture of methyl bromide and ethyl bromide is treated with sodium metal in presence of dry ether?

Which of the following alkenes, on oxidation by $\mathrm{KMnO}_4$ in dil. $\mathrm{H}_2 \mathrm{SO}_4$ forms adipic acid?