The common name of isopropyl benzene is

Which of the following is the major product from the sulfonation of $\alpha$-tetralone?

Given the following structures:
$(I)$ $1,3,5-$trimethylbenzene (mesitylene)
$(II)$ $1,3-$dimethyl$-5-$methylenecyclohexa$-1,3-$diene
$(III)$ $1,3,5-$trimethylenecyclohexane
The enthalpy of hydrogenation of these compounds will be in the order as:

What is the major product of the following reaction?
$1,4-dichlorocyclohexa-1,4-diene \xrightarrow{Na, \text{dry ether}} ?$

The reaction of benzene with $CH_3COCl$ in the presence of $AlCl_3$ yields ...........

Which of the following compounds is most reactive toward an electrophilic substitution reaction?