${C_6}{H_6} + C{l_2}\xrightarrow{{Sunlight}}\,?$
$CH_3CH_2CH_2CH_2CH_2CH_3$ $(CH_3)_3 CCH_2CH_3$ $(CH_3)_2CHCH_2CH_2CH_3$ $(CH_3)_2CHCH(CH_3)_2$