Which of the following is the most correct electron displacement for a nucleophilic reaction to take place? 

1.
2.
3.
4.

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?

1. –SO₃H

2. –COOH

3. –NO₂

4. –C≡N

Among the following compounds the one that is most reactive towards electrophilic nitration is:
1. Benzoic acid
2. Nitrobenzene
3. Toluene
4. Benzene

Among cyclohexanol (I), acetic acid (II), 2, 4, 6-trinitrophenol (III) and phenol (IV) the correct order of decreasing acidic character will be:

Which one is most reactive towards S_N1 reaction?

1. $C_6{H}_{5}CH\left(C_6{H}_5\right)Br$

2. $C_6{H}_{5}CH\left(C{H}_3\right)Br$

3. $C_6{H}_{5}C\left(C{H}_3\right)\left(C_6{H}_5\right)Br$

4. $C_6{H}_{5}C{H}_{2}Br$

Which one of the following is most reactive towards electrophilic attack?
 

1.		2.
3.		4.

In a S_N2 substitution reaction of the type 
 $\mathrm{R}-\mathrm{Br}+{\mathrm{Cl}}^{-}\stackrel{\mathrm{DMF}}{\to }\mathrm{R}-\mathrm{Cl}+{\mathrm{Br}}^{-}$
which one of the following has the highest relative rate?
 

1.	\(\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_2 \mathrm{Br}\)	2.
3.		4.	\(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}\)