231514
The electrophile involved in the sulphonation of benzene is
1 $\mathrm{SO}_{3}^{+}$
2 $\mathrm{SO}_{3}^{2-}$
3 $\mathrm{H}_{3}^{+} \mathrm{O}$
4 $\mathrm{SO}_{3}$
Explanation:
The electrophile involved in the sulphonation of benzene is $\mathrm{SO}_{3}$. $2 \mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{SO}_{3}+\mathrm{H}_{3} \mathrm{O}+\mathrm{HSO}_{4}^{-}$
2009]**
GENERAL ORGANIC CHEMISTRY
231517
With respect to chlorobenzene, which of the following statements is not correct?
1 $\mathrm{Cl}$ is ortho/para directing
2 $\mathrm{Cl}$ exhibits $+\mathrm{M}$ effect
3 $\mathrm{Cl}$ is ring deactivating
4 $\mathrm{Cl}$ is meta directing
Explanation:
Chlorobenzene is ortho/para directing for electrophilic substitution reaction. By the help of this resonating structure we conclude that chlorobenzene is a ortho/para directing.
BCECE-2014
GENERAL ORGANIC CHEMISTRY
231518
Amines behave as
1 Lewis acid
2 Lewis base
3 aprotic acid
4 neutral compound
Explanation:
The substance which can donate a pair of electrons is called Lewis base. Amines contain a lone pair of electron on nitrogen atom, so behave as Lewis base.
2008]**
GENERAL ORGANIC CHEMISTRY
231519
Arrange the following in the decreasing order of basic character. I. p-toluidine II. N, N-dimethyl-p-toluidine III. p-nitroaniline IV. Aniline
1 II $>$ III $>$ I $>$ IV
2 I $>$ II $>$ III $>$ IV
3 II $>$ I $>$ IV $>$ III
4 IV $>$ III $>$ I $>$ II
Explanation:
(C) : In all structures lone pair nitrogen is delocalised in benzene ring, this situation have same basicity. The other condition is \(+I\) and \(-I\) effect. \(+I\) effect increase the basicity and \(-I\) effect decrease it. Hence, the order of basicity is- II \(>\) I \(>\) IV \(>\) III
231514
The electrophile involved in the sulphonation of benzene is
1 $\mathrm{SO}_{3}^{+}$
2 $\mathrm{SO}_{3}^{2-}$
3 $\mathrm{H}_{3}^{+} \mathrm{O}$
4 $\mathrm{SO}_{3}$
Explanation:
The electrophile involved in the sulphonation of benzene is $\mathrm{SO}_{3}$. $2 \mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{SO}_{3}+\mathrm{H}_{3} \mathrm{O}+\mathrm{HSO}_{4}^{-}$
2009]**
GENERAL ORGANIC CHEMISTRY
231517
With respect to chlorobenzene, which of the following statements is not correct?
1 $\mathrm{Cl}$ is ortho/para directing
2 $\mathrm{Cl}$ exhibits $+\mathrm{M}$ effect
3 $\mathrm{Cl}$ is ring deactivating
4 $\mathrm{Cl}$ is meta directing
Explanation:
Chlorobenzene is ortho/para directing for electrophilic substitution reaction. By the help of this resonating structure we conclude that chlorobenzene is a ortho/para directing.
BCECE-2014
GENERAL ORGANIC CHEMISTRY
231518
Amines behave as
1 Lewis acid
2 Lewis base
3 aprotic acid
4 neutral compound
Explanation:
The substance which can donate a pair of electrons is called Lewis base. Amines contain a lone pair of electron on nitrogen atom, so behave as Lewis base.
2008]**
GENERAL ORGANIC CHEMISTRY
231519
Arrange the following in the decreasing order of basic character. I. p-toluidine II. N, N-dimethyl-p-toluidine III. p-nitroaniline IV. Aniline
1 II $>$ III $>$ I $>$ IV
2 I $>$ II $>$ III $>$ IV
3 II $>$ I $>$ IV $>$ III
4 IV $>$ III $>$ I $>$ II
Explanation:
(C) : In all structures lone pair nitrogen is delocalised in benzene ring, this situation have same basicity. The other condition is \(+I\) and \(-I\) effect. \(+I\) effect increase the basicity and \(-I\) effect decrease it. Hence, the order of basicity is- II \(>\) I \(>\) IV \(>\) III
231514
The electrophile involved in the sulphonation of benzene is
1 $\mathrm{SO}_{3}^{+}$
2 $\mathrm{SO}_{3}^{2-}$
3 $\mathrm{H}_{3}^{+} \mathrm{O}$
4 $\mathrm{SO}_{3}$
Explanation:
The electrophile involved in the sulphonation of benzene is $\mathrm{SO}_{3}$. $2 \mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{SO}_{3}+\mathrm{H}_{3} \mathrm{O}+\mathrm{HSO}_{4}^{-}$
2009]**
GENERAL ORGANIC CHEMISTRY
231517
With respect to chlorobenzene, which of the following statements is not correct?
1 $\mathrm{Cl}$ is ortho/para directing
2 $\mathrm{Cl}$ exhibits $+\mathrm{M}$ effect
3 $\mathrm{Cl}$ is ring deactivating
4 $\mathrm{Cl}$ is meta directing
Explanation:
Chlorobenzene is ortho/para directing for electrophilic substitution reaction. By the help of this resonating structure we conclude that chlorobenzene is a ortho/para directing.
BCECE-2014
GENERAL ORGANIC CHEMISTRY
231518
Amines behave as
1 Lewis acid
2 Lewis base
3 aprotic acid
4 neutral compound
Explanation:
The substance which can donate a pair of electrons is called Lewis base. Amines contain a lone pair of electron on nitrogen atom, so behave as Lewis base.
2008]**
GENERAL ORGANIC CHEMISTRY
231519
Arrange the following in the decreasing order of basic character. I. p-toluidine II. N, N-dimethyl-p-toluidine III. p-nitroaniline IV. Aniline
1 II $>$ III $>$ I $>$ IV
2 I $>$ II $>$ III $>$ IV
3 II $>$ I $>$ IV $>$ III
4 IV $>$ III $>$ I $>$ II
Explanation:
(C) : In all structures lone pair nitrogen is delocalised in benzene ring, this situation have same basicity. The other condition is \(+I\) and \(-I\) effect. \(+I\) effect increase the basicity and \(-I\) effect decrease it. Hence, the order of basicity is- II \(>\) I \(>\) IV \(>\) III
231514
The electrophile involved in the sulphonation of benzene is
1 $\mathrm{SO}_{3}^{+}$
2 $\mathrm{SO}_{3}^{2-}$
3 $\mathrm{H}_{3}^{+} \mathrm{O}$
4 $\mathrm{SO}_{3}$
Explanation:
The electrophile involved in the sulphonation of benzene is $\mathrm{SO}_{3}$. $2 \mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{SO}_{3}+\mathrm{H}_{3} \mathrm{O}+\mathrm{HSO}_{4}^{-}$
2009]**
GENERAL ORGANIC CHEMISTRY
231517
With respect to chlorobenzene, which of the following statements is not correct?
1 $\mathrm{Cl}$ is ortho/para directing
2 $\mathrm{Cl}$ exhibits $+\mathrm{M}$ effect
3 $\mathrm{Cl}$ is ring deactivating
4 $\mathrm{Cl}$ is meta directing
Explanation:
Chlorobenzene is ortho/para directing for electrophilic substitution reaction. By the help of this resonating structure we conclude that chlorobenzene is a ortho/para directing.
BCECE-2014
GENERAL ORGANIC CHEMISTRY
231518
Amines behave as
1 Lewis acid
2 Lewis base
3 aprotic acid
4 neutral compound
Explanation:
The substance which can donate a pair of electrons is called Lewis base. Amines contain a lone pair of electron on nitrogen atom, so behave as Lewis base.
2008]**
GENERAL ORGANIC CHEMISTRY
231519
Arrange the following in the decreasing order of basic character. I. p-toluidine II. N, N-dimethyl-p-toluidine III. p-nitroaniline IV. Aniline
1 II $>$ III $>$ I $>$ IV
2 I $>$ II $>$ III $>$ IV
3 II $>$ I $>$ IV $>$ III
4 IV $>$ III $>$ I $>$ II
Explanation:
(C) : In all structures lone pair nitrogen is delocalised in benzene ring, this situation have same basicity. The other condition is \(+I\) and \(-I\) effect. \(+I\) effect increase the basicity and \(-I\) effect decrease it. Hence, the order of basicity is- II \(>\) I \(>\) IV \(>\) III
