The product obtained from the ozonolysis of benzene is........

Give the names and structures of some cancer-causing hydrocarbons.

Friedel-Crafts reaction using $MeCl$ and anhydrous $AlCl_3$ will take place most efficiently with

The electrophile $NO_2^+$ reacts with which of the following compounds? In which case will $NO_2^+$ attack at the meta position?
$(I)$ $C_6H_5-CCl_3$
$(II)$ $C_6H_5-NO_2$
$(III)$ $C_6H_5-CHO$
$(IV)$ $C_6H_5-O^-$

Which of the following Friedel-Crafts reactions is incorrectly written?

Benzene can be obtained by heating either benzoic acid with $X$ or phenol with $Y$. $X$ and $Y$ are respectively