Hyperconjugation is not observed in

Identify ortho and para directing groups from the following: $I. -CHO$,$II. -NHCOCH_3$,$III. -OCH_3$,$IV. -SO_3H$.

In which of the following molecules is the electron density on the oxygen atom $NOT$ correctly mentioned?

Which of the following is correctly matched with their property?

The functional group that shows negative resonance effect ($-R$ effect) is:

With respect to the compounds $I-V$,choose the correct statement$(s)$.
$(A)$ The acidity of compound $I$ is due to delocalization in the conjugate base.
$(B)$ The conjugate base of compound $IV$ is aromatic.
$(C)$ Compound $II$ becomes more acidic,when it has a $-NO_2$ substituent.
$(D)$ The acidity of compounds follows the order $IV > V > I > II > III$.