Which of the following $n$ mole compound is obtained when $2n$ moles of $\text{C}_6\text{H}_5\text{Cl}$ treated of with $2n$ mole sodium atom in dry ether?

Which from the following compounds is not obtained when methyl bromide is treated with ethyl bromide in presence of sodium metal in dry ether?

Which from following compounds is NOT optically active?

The major product of the following reaction is