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HALOALKANES AND HALOARENES

91089 The major product obtained when chlorobenzene is nitrated with ${HNO}_{3} +$ conc. $H_{2} {SO}_{4}$ is

1 1-chloro-4-nitrobenzene

2 1-chloro-2-nitrobenzene

3 1-chloro-3-nitrobenzene

4 1-chloro-1-nitrobenzene.

**[COMEDK 2014]**

HALOALKANES AND HALOARENES

91092 Amongst the following, the compound which is most difficult to sulphonate is-

1 benzene

2 nitrobenzene

3 toluene

4 chlorobenzene

Explanation:

${NO}_{2}$ group is electron withdrawing group and deactivation group. Sulphonation of nitrobenzene is most difficult.

**[BCECE-2011]**

HALOALKANES AND HALOARENES

91093 Which one is most reactive towards $S_{N} 1$ reaction?

1

C_{6} H_{5} CH (C_{6} H_{5}) Br

2

C_{6} H_{5} CH ({CH}_{3}) Br

3

C_{6} H_{5} C ({CH}_{3}) (C_{6} H_{5}) Br

4

C_{6} H_{5} {CH}_{2} Br

Explanation:

In $C_{6} H_{5} C ({CH}_{3}) (C_{6} H_{5}) Br$ formed carbocation will be $3^{\circ}$ and order of reactivity for $S_{N} 1$ will be $3^{\circ} > 2^{\circ} > 1^{\circ}$ .
So - $C_{6} H_{5} C ({CH}_{3}) (C_{6} H_{5}) Br$ is most reactive towards $S_{N} 1$ reaction.

**[AIPMT -2010]**

HALOALKANES AND HALOARENES

91094 The best method to separate the mixture of ortho and Para nitrophenol $(1 : 1)$ is

1 vaporisation

2 colour spectrum

3 distillation

4 crystallistion

**[UP CPMT-2008]**

HALOALKANES AND HALOARENES

91089 The major product obtained when chlorobenzene is nitrated with ${HNO}_{3} +$ conc. $H_{2} {SO}_{4}$ is

1 1-chloro-4-nitrobenzene

2 1-chloro-2-nitrobenzene

3 1-chloro-3-nitrobenzene

4 1-chloro-1-nitrobenzene.

**[COMEDK 2014]**

HALOALKANES AND HALOARENES

91092 Amongst the following, the compound which is most difficult to sulphonate is-

1 benzene

2 nitrobenzene

3 toluene

4 chlorobenzene

Explanation:

${NO}_{2}$ group is electron withdrawing group and deactivation group. Sulphonation of nitrobenzene is most difficult.

**[BCECE-2011]**

HALOALKANES AND HALOARENES

91093 Which one is most reactive towards $S_{N} 1$ reaction?

1

C_{6} H_{5} CH (C_{6} H_{5}) Br

2

C_{6} H_{5} CH ({CH}_{3}) Br

3

C_{6} H_{5} C ({CH}_{3}) (C_{6} H_{5}) Br

4

C_{6} H_{5} {CH}_{2} Br

Explanation:

In $C_{6} H_{5} C ({CH}_{3}) (C_{6} H_{5}) Br$ formed carbocation will be $3^{\circ}$ and order of reactivity for $S_{N} 1$ will be $3^{\circ} > 2^{\circ} > 1^{\circ}$ .
So - $C_{6} H_{5} C ({CH}_{3}) (C_{6} H_{5}) Br$ is most reactive towards $S_{N} 1$ reaction.

**[AIPMT -2010]**

HALOALKANES AND HALOARENES

91094 The best method to separate the mixture of ortho and Para nitrophenol $(1 : 1)$ is

1 vaporisation

2 colour spectrum

3 distillation

4 crystallistion

**[UP CPMT-2008]**

HALOALKANES AND HALOARENES

91089 The major product obtained when chlorobenzene is nitrated with ${HNO}_{3} +$ conc. $H_{2} {SO}_{4}$ is

1 1-chloro-4-nitrobenzene

2 1-chloro-2-nitrobenzene

3 1-chloro-3-nitrobenzene

4 1-chloro-1-nitrobenzene.

**[COMEDK 2014]**

HALOALKANES AND HALOARENES

91092 Amongst the following, the compound which is most difficult to sulphonate is-

1 benzene

2 nitrobenzene

3 toluene

4 chlorobenzene

Explanation:

${NO}_{2}$ group is electron withdrawing group and deactivation group. Sulphonation of nitrobenzene is most difficult.

**[BCECE-2011]**

HALOALKANES AND HALOARENES

91093 Which one is most reactive towards $S_{N} 1$ reaction?

1

C_{6} H_{5} CH (C_{6} H_{5}) Br

2

C_{6} H_{5} CH ({CH}_{3}) Br

3

C_{6} H_{5} C ({CH}_{3}) (C_{6} H_{5}) Br

4

C_{6} H_{5} {CH}_{2} Br

Explanation:

In $C_{6} H_{5} C ({CH}_{3}) (C_{6} H_{5}) Br$ formed carbocation will be $3^{\circ}$ and order of reactivity for $S_{N} 1$ will be $3^{\circ} > 2^{\circ} > 1^{\circ}$ .
So - $C_{6} H_{5} C ({CH}_{3}) (C_{6} H_{5}) Br$ is most reactive towards $S_{N} 1$ reaction.

**[AIPMT -2010]**

HALOALKANES AND HALOARENES

91094 The best method to separate the mixture of ortho and Para nitrophenol $(1 : 1)$ is

1 vaporisation

2 colour spectrum

3 distillation

4 crystallistion

**[UP CPMT-2008]**

HALOALKANES AND HALOARENES

91089 The major product obtained when chlorobenzene is nitrated with ${HNO}_{3} +$ conc. $H_{2} {SO}_{4}$ is

1 1-chloro-4-nitrobenzene

2 1-chloro-2-nitrobenzene

3 1-chloro-3-nitrobenzene

4 1-chloro-1-nitrobenzene.

**[COMEDK 2014]**

HALOALKANES AND HALOARENES

91092 Amongst the following, the compound which is most difficult to sulphonate is-

1 benzene

2 nitrobenzene

3 toluene

4 chlorobenzene

Explanation:

${NO}_{2}$ group is electron withdrawing group and deactivation group. Sulphonation of nitrobenzene is most difficult.

**[BCECE-2011]**

HALOALKANES AND HALOARENES

91093 Which one is most reactive towards $S_{N} 1$ reaction?

1

C_{6} H_{5} CH (C_{6} H_{5}) Br

2

C_{6} H_{5} CH ({CH}_{3}) Br

3

C_{6} H_{5} C ({CH}_{3}) (C_{6} H_{5}) Br

4

C_{6} H_{5} {CH}_{2} Br

Explanation:

In $C_{6} H_{5} C ({CH}_{3}) (C_{6} H_{5}) Br$ formed carbocation will be $3^{\circ}$ and order of reactivity for $S_{N} 1$ will be $3^{\circ} > 2^{\circ} > 1^{\circ}$ .
So - $C_{6} H_{5} C ({CH}_{3}) (C_{6} H_{5}) Br$ is most reactive towards $S_{N} 1$ reaction.

**[AIPMT -2010]**

HALOALKANES AND HALOARENES

91094 The best method to separate the mixture of ortho and Para nitrophenol $(1 : 1)$ is

1 vaporisation

2 colour spectrum

3 distillation

4 crystallistion

**[UP CPMT-2008]**