Ring nitration of dimethylbenzene results in the formation of only one nitro dimethylbenzene. The dimethylbenzene is

When comparing the hydrogenation of benzene with that of a hypothetical $1,3,5-$cyclohexatriene,benzene .................... than the cyclohexatriene.

In which of the following reactions,$t$-butyl benzene is formed?
$1.$ Benzene $+ t$-butyl chloride $\xrightarrow{AlCl_3}$
$2.$ Benzene $+ (CH_3)_2C=CH_2 \xrightarrow{BF_3/HF}$
$3.$ Benzene $+ t$-butyl alcohol $\xrightarrow{H_2SO_4}$
$4.$ Benzene $+$ butanoyl chloride $\xrightarrow{AlCl_3}$ $\xrightarrow{Zn/Hg, HCl}$

$n$-heptane $\xrightarrow[600\ {}^oC]{Cr_2O_3/V_2O_5}$ ?

Rank in order of increasing rate of reaction towards $EAS$ with bromine in the presence of $FeBr_3$.

The major product obtained in the reaction of toluene with $1-$bromo$-2-$methylpropane in the presence of anhydrous $AlCl_3$ is