Considering the following reaction sequence, the correct statement(s) is (are)
 

Compounds  $\mathbf{P}$ and $\mathbf{Q}$  are carboxylic acids.

Compound $\mathbf{R}$  reacts with dialkylcadmium to give the corresponding tertiary alcohol.

Compound  $\mathbf{S}$ decolorizes bromine water

Compounds $\mathbf{P}$  and $\mathbf{S}$ react with hydroxylamine to give the corresponding oximes.