The electron displacement effect observed in the given structures is known as

From the following,identify the groups that exhibit negative resonance $(-R)$ effect when attached to a conjugated system: $(A)$ formyl,$(B)$ amino,$(C)$ alkoxy,$(D)$ cyano,$(E)$ nitro

Match column $-I$ and column $-II$ with the correct electronic effect relation:

Column $-I$	Column $-II$
$(i)$ $C_6H_5NH_2$	$(p)$ $-R$ effect
$(ii)$ $C_6H_5OH$	$(q)$ $+R$ effect
$(iii)$ $C_6H_5NO_2$	$(r)$ $+I$ effect
$(iv)$ $CH_3CH_2Cl$	$(s)$ $-I$ effect

$+I$ effect is shown by:

The decreasing order of acidic strengths of the following compounds is:

In which of the following groups is the $(-M)$ effect observed?