Find the compound that has the maximum enol content.

Hyperconjugation is not observed in

The correct order of the stability of the following compounds based on hyperconjugation is

Among the following,the most acidic compound is

Given below are two statements:
Statement $I$: In $O_2N-C_6H_4-CH^+-C_6H_4-OCH_3$,the carbocation is stabilised by $+R$ effect of $-OCH_3$ group.
Statement $II$: In $O_2N-C_6H_4-CH^--C_6H_4-OCH_3$,the carbanion is stabilised by $-R$ effect of $-NO_2$ group.
In the light of the above statements,choose the correct answer from the options given below:

Hyperconjugation involves the overlap of which of the following orbitals?