What is the end product obtained on the nitration of toluene?

Amongst the following,the compound that can be most readily sulphonated is

In benzene,the total number of $\sigma$ bonds is

The total number of compounds from the list below that,when treated with hot $KMnO_4$,yield benzoic acid is:

Nitration is an example of aromatic electrophilic substitution reaction and its rate depends upon the group already present in the benzene ring. Out of benzene and phenol,which one is more easily nitrated?

Which of the following reactions takes place when a mixture of concentrated $HNO_3$ and $H_2SO_4$ reacts with benzene at $350 \ K$?