By aerial oxidation,which one of the following gives phthalic acid?

Hydrogenation of $C_6H_5CHOHCOOH$ over $Rh-Al_2O_3$ catalyst in methanol gives:

Heating benzene in a large excess of $80\% \, D_2SO_4$ in $D_2O$ results in what product?

Benzene on nitration gives nitrobenzene in the presence of a mixture of $HNO_3$ and $H_2SO_4$,where:

Which of the following is/are produced when a mixture of benzene vapour and oxygen is passed over $V_2O_5$ catalyst at $775\, K$?

Which of the following compounds is most reactive toward an electrophilic substitution reaction?