The hydrogenation of some compounds to cyclohexane generates the following amount of heat:(kcal/mol)

Cyclohexene                 -28    1,3-cyclohexadiene         -54

1,4-cyclohexadiene       -56     Benzene                         -49

Based on these data, the best estimate of the resonance energy of benzene 

The chlorine atom of the following compound

that reacts most readily with ${\mathrm{AgNO}}_3$ to give a precipitate is

Given below are two statements :

Statement I : Hyperconjugation is a permanent effect.

Statement II : Hyperconjugation in ethyl cation $\left({\mathrm{CH}}_3-\stackrel{+}{\mathrm{C}}{\mathrm{H}}_2\right)$ involves the overlapping of ${\mathrm{C}}_{{\mathrm{sp}}^2}-{\mathrm{H}}_{1\mathrm{s}}$ bond with empty $2\mathrm{p}$ orbital of other carbon.

Choose the correct option:

The most acidic proton and the strongest nucleophilic nitrogen in the following compound

respectively, are

Among the given species the Resonance stabilised carbocations are: