Which of the following $n$ mole compound is obtained when $2n$ moles of $C_6H_5Cl$ are treated with $2n$ moles of sodium atom in the presence of dry ether?

The chemicals used for preparing acetophenone via Friedel-Crafts acylation are:
$(A)$ $C_6H_6$
$(B)$ $CH_3COCH_3$
$(C)$ $CH_3COCl$
$(D)$ Anhydrous $AlCl_3$

Which has maximum dipole moment?

In which reaction does nitrobenzene give $o$- and $p$-substituted products?

Assertion : $S_{N}2$ reactions always proceed with inversion of configuration.
Reason : $S_{N}2$ reaction of an optically active aryl halide with an aqueous solution of $KOH$ always gives an alcohol with opposite sign of rotation.

With respect to chlorobenzene,which of the following statements is not correct?