During reaction of benzene with neopentyl chloride in the presence of ${\mathrm{AlCl}}_3,$ the major product is $2-\text{methyl}-2 \text{phenylbutane}$ and not neopentylbenzene. Explain:

Predict the mononitration products of the following compound:

Predict the mononitration products of the following compound:

Predict the mononitration products of the following compound:

Predict the mononitration products of the following compound:

Predict the mononitration products of the following compound:

Nitration of the following compound gives:

Arrange the following in decreasing order of their reactivity with an electrophile:
               $\left(\mathrm{I}\right)$                           $\left(\mathrm{II}\right)$                              $\left(\mathrm{III}\right)$                          $\left(\mathrm{IV}\right)$

Arrange the following in decreasing order of their reactivity with an electrophile:
               $\left(\mathrm{I}\right)$                              $\left(\mathrm{II}\right)$                          $\left(\mathrm{III}\right)$                           $\left(\mathrm{IV}\right)$