Arrange the following halides in the decreasing order of S_N1 reactivity:

(I) ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{Cl}$

(II) ${\mathrm{CH}}_2=\mathrm{CHCH}\left(\mathrm{Cl}\right){\mathrm{CH}}_3$

(III) ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CH}\left(\mathrm{Cl}\right){\mathrm{CH}}_3$

1. I > II > III

2. II > I > III

3. II > III > I

4. III > II > I

Replacement of 'Cl' of  chlorobenzene to give phenol requires drastic conditions but chlorine of 2,4- dinitrochloro benzene is readily replaced because

1. ${\mathrm{NO}}_2$ makes the ring electrons rich at ortho and para position

2. ${\mathrm{NO}}_2$ withdraws electrons from meta position

3. ${\mathrm{NO}}_2$ donates electrons at m-position

4. ${\mathrm{NO}}_2$ withdraws electrons from ortho and para positions 

Among the following bromides given below, the order of their reactivity in the S_N1 reaction is 

1. III > II > I

2. II > III > I

3. III > I > II

4. II > I > III

Which haloarenes is most reactive towards electrophilic substitution reaction ?

1.		2.
3.		4.

When chloroform is reacted with excess of NaOH then final product formed is 

1. HCOOH

2. ${\mathrm{CH}}_3\mathrm{COOH}$

3. ${\mathrm{CH}}_3\mathrm{COONa}$

4. HCOONa

The ease of aromatic nucleophilic substitution among these compounds will be in the order as :

1. IV > I > II >III

2. IV > III > II > I

3. III > II > IV >I

4. I > II > III > IV 

The hydrolysis reaction that takes place at the slowest rate among the following is

1.
2.	\(H_3CCH_2Cl~\xrightarrow{~~aq.~NaOH~~}H_3CCH_2OH~ \)
3.	\(H_2C=CHCH_2Cl~\xrightarrow{~~aq.~NaOH~~}H_2C=CHCH_2OH~ \)
4.

For the following : 
(i) I^- 
(ii) Cl^- 
(iii) Br^- 
The increasing order of nucleophilicity would be :

1. I^-<Br^-<Cl^-

2. Cl^-<Br^-<I^- 

3. I^- <Cl^-<Br^-

4. Br^-<Cl^-<I^-

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.  ${\mathrm{CH}}_3-\underset{\mathrm{Br}}{\underset{|}{\mathrm{CH}}}-{\mathrm{CH}}_2\mathrm{Br}$

3.  ${\mathrm{CH}}_3-\underset{{\mathrm{CH}}_3}{\overset{{\mathrm{CH}}_3}{\underset{\left|}{\overset{\right|}{\mathrm{C}}}}}-{\mathrm{CH}}_2\mathrm{Br}$

4.  ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Br}$

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. $C_6{H}_{5}C{H}_{2}Br$