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 of the following pair of reagents is used for the conversion of carboxylic acid to alcohol ?

Which from the following hydroxy compounds contain only one $-\text{OH}$ group in a molecule?

Identify the compound obtained when ethyl methyl ketone is treated with $\text{CH}_3\text{MgBr}$ and hydrolyzed.