Which one of the nitrogen atoms in $H_2N-NH-CO-NH_2$ (where the atoms are labeled $I, II, III$ as shown in the structure) is the most nucleophilic?

Mesomeric effect involves delocalisation of

Match the following electronic effects in List-$I$ with their corresponding examples or representations in List-$II$.

List-$I$	List-$II$
$(A)$ Resonance	$(I)$ $C=C + H^+ \rightarrow C^+-C-H$
$(B)$ Inductive effect	$(II)$ $H-CH_2-CH_2^+ \leftrightarrow H-CH_2=CH_2^+$
$(C)$ Electromeric effect	$(III)$ $C_6H_6$
$(D)$ Hyperconjugation	$(IV)$ $CH_3-Z \rightarrow CH_3^- + Z^+$
	$(V)$ $CH_3-CH_2-CH_2Cl$

Find the compound that has the maximum enol content.

The migratory aptitude of the following groups in decreasing order is:

Which of the following statements are $TRUE$?
$(I)$ Inductive effect operates through the $\sigma$ bond
$(II)$ Resonance effect operates through the $\pi$ bond
$(III)$ Inductive effects operate through the $\pi$ bond
$(IV)$ Resonance effect operates through the $\sigma$ bond