Which of the following compound on reduction gives benzene?

X-Ray diffraction reveals that benzene is a …………. structure.

$\gamma \backslash gamma$-isomer of BHC is known as ………

Benzene when treated with ozone forms ………

………. is formed as intermediate product in ozonolysis of benzene.

Electrophile in chlorination of benzene is …………

Benzene when treated with fuming. $H_{2}S{O}_{4}H\_2\; SO\_4$ at 373 K forms ………

Ethyl chloride reacts with benzene in presence of anhydrous aluminium chloride to form …………

The electrophile in Friedel-Craft’s alkylation reaction is ………

The first fraction obtained during the fractionation of petroleum is: