322822
Arrange the following compounds in decreasing order of their reactivity with sodium methoxide in menthanol at \({\rm{50^\circ C}}\).
1 II \(>\) III \(>\) IV \(>\) I
2 II \(\approx\) IV \(>\) III \(>\) I
3 II \(\approx\) III \(>\) I \(>\) IV
4 II \(\approx\) IV \(\approx\) III \(>\) I
Explanation:
The reaction is an example of nucleophilic aromatic substitution that involves the formation of carbanion as an intermediate. The carbanion from ortho and para chloronitrobenzenes are more stable than that from the m-isomer that, in turn, is more stable than that obtained from chlorobenzene, and is due to electronwithdrawing \(-\mathrm{NO}_{2}\) group.
CHXII10:HALOALKANES AND HALOARENES
322823
Predict the main product in
1 phenyl cyanide
2 nitrophenol
3 aniline
4 hydroxylamine
Explanation:
CHXII10:HALOALKANES AND HALOARENES
322824
Reactivity order of the following towards \(\mathrm{NaOEt}, \mathrm{EtOH}\)
1 III \(>\) II \(>\) I
2 II \(>\) I \(>\) III
3 I \(>\) II \(>\) III
4 III \(>\) I \(>\) II
Explanation:
Nucleophilic substitution of aryl halides is favoured by electron withdrawing substituents attached at ortho and para positions to the halide atom. So, reactivity order of given compounds towards \(\mathrm{NaOEt}\) and \(\mathrm{EtOH}\) is
CHXII10:HALOALKANES AND HALOARENES
322825
The correct order of reactivity of following haloarenes towards nucleophilic substitution with aqueous NaOH is
Choose the correct answer from the options given below.
1 A > B > D > C
2 D > C > B > A
3 D > B > A > C
4 C > A > D > B
Explanation:
SN reaction in chlorobenzene increases by the presence of an EWG at ortho and para positions with respect to chlorine. Stronger thestrength of the EWG, higher the reactivity. Nitro group is a strong EWG. Hence, the correct order of nucleophilic substitution will be \(\mathrm{D}>\mathrm{B}>\mathrm{A}>\mathrm{C}\).
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CHXII10:HALOALKANES AND HALOARENES
322822
Arrange the following compounds in decreasing order of their reactivity with sodium methoxide in menthanol at \({\rm{50^\circ C}}\).
1 II \(>\) III \(>\) IV \(>\) I
2 II \(\approx\) IV \(>\) III \(>\) I
3 II \(\approx\) III \(>\) I \(>\) IV
4 II \(\approx\) IV \(\approx\) III \(>\) I
Explanation:
The reaction is an example of nucleophilic aromatic substitution that involves the formation of carbanion as an intermediate. The carbanion from ortho and para chloronitrobenzenes are more stable than that from the m-isomer that, in turn, is more stable than that obtained from chlorobenzene, and is due to electronwithdrawing \(-\mathrm{NO}_{2}\) group.
CHXII10:HALOALKANES AND HALOARENES
322823
Predict the main product in
1 phenyl cyanide
2 nitrophenol
3 aniline
4 hydroxylamine
Explanation:
CHXII10:HALOALKANES AND HALOARENES
322824
Reactivity order of the following towards \(\mathrm{NaOEt}, \mathrm{EtOH}\)
1 III \(>\) II \(>\) I
2 II \(>\) I \(>\) III
3 I \(>\) II \(>\) III
4 III \(>\) I \(>\) II
Explanation:
Nucleophilic substitution of aryl halides is favoured by electron withdrawing substituents attached at ortho and para positions to the halide atom. So, reactivity order of given compounds towards \(\mathrm{NaOEt}\) and \(\mathrm{EtOH}\) is
CHXII10:HALOALKANES AND HALOARENES
322825
The correct order of reactivity of following haloarenes towards nucleophilic substitution with aqueous NaOH is
Choose the correct answer from the options given below.
1 A > B > D > C
2 D > C > B > A
3 D > B > A > C
4 C > A > D > B
Explanation:
SN reaction in chlorobenzene increases by the presence of an EWG at ortho and para positions with respect to chlorine. Stronger thestrength of the EWG, higher the reactivity. Nitro group is a strong EWG. Hence, the correct order of nucleophilic substitution will be \(\mathrm{D}>\mathrm{B}>\mathrm{A}>\mathrm{C}\).
322822
Arrange the following compounds in decreasing order of their reactivity with sodium methoxide in menthanol at \({\rm{50^\circ C}}\).
1 II \(>\) III \(>\) IV \(>\) I
2 II \(\approx\) IV \(>\) III \(>\) I
3 II \(\approx\) III \(>\) I \(>\) IV
4 II \(\approx\) IV \(\approx\) III \(>\) I
Explanation:
The reaction is an example of nucleophilic aromatic substitution that involves the formation of carbanion as an intermediate. The carbanion from ortho and para chloronitrobenzenes are more stable than that from the m-isomer that, in turn, is more stable than that obtained from chlorobenzene, and is due to electronwithdrawing \(-\mathrm{NO}_{2}\) group.
CHXII10:HALOALKANES AND HALOARENES
322823
Predict the main product in
1 phenyl cyanide
2 nitrophenol
3 aniline
4 hydroxylamine
Explanation:
CHXII10:HALOALKANES AND HALOARENES
322824
Reactivity order of the following towards \(\mathrm{NaOEt}, \mathrm{EtOH}\)
1 III \(>\) II \(>\) I
2 II \(>\) I \(>\) III
3 I \(>\) II \(>\) III
4 III \(>\) I \(>\) II
Explanation:
Nucleophilic substitution of aryl halides is favoured by electron withdrawing substituents attached at ortho and para positions to the halide atom. So, reactivity order of given compounds towards \(\mathrm{NaOEt}\) and \(\mathrm{EtOH}\) is
CHXII10:HALOALKANES AND HALOARENES
322825
The correct order of reactivity of following haloarenes towards nucleophilic substitution with aqueous NaOH is
Choose the correct answer from the options given below.
1 A > B > D > C
2 D > C > B > A
3 D > B > A > C
4 C > A > D > B
Explanation:
SN reaction in chlorobenzene increases by the presence of an EWG at ortho and para positions with respect to chlorine. Stronger thestrength of the EWG, higher the reactivity. Nitro group is a strong EWG. Hence, the correct order of nucleophilic substitution will be \(\mathrm{D}>\mathrm{B}>\mathrm{A}>\mathrm{C}\).
322822
Arrange the following compounds in decreasing order of their reactivity with sodium methoxide in menthanol at \({\rm{50^\circ C}}\).
1 II \(>\) III \(>\) IV \(>\) I
2 II \(\approx\) IV \(>\) III \(>\) I
3 II \(\approx\) III \(>\) I \(>\) IV
4 II \(\approx\) IV \(\approx\) III \(>\) I
Explanation:
The reaction is an example of nucleophilic aromatic substitution that involves the formation of carbanion as an intermediate. The carbanion from ortho and para chloronitrobenzenes are more stable than that from the m-isomer that, in turn, is more stable than that obtained from chlorobenzene, and is due to electronwithdrawing \(-\mathrm{NO}_{2}\) group.
CHXII10:HALOALKANES AND HALOARENES
322823
Predict the main product in
1 phenyl cyanide
2 nitrophenol
3 aniline
4 hydroxylamine
Explanation:
CHXII10:HALOALKANES AND HALOARENES
322824
Reactivity order of the following towards \(\mathrm{NaOEt}, \mathrm{EtOH}\)
1 III \(>\) II \(>\) I
2 II \(>\) I \(>\) III
3 I \(>\) II \(>\) III
4 III \(>\) I \(>\) II
Explanation:
Nucleophilic substitution of aryl halides is favoured by electron withdrawing substituents attached at ortho and para positions to the halide atom. So, reactivity order of given compounds towards \(\mathrm{NaOEt}\) and \(\mathrm{EtOH}\) is
CHXII10:HALOALKANES AND HALOARENES
322825
The correct order of reactivity of following haloarenes towards nucleophilic substitution with aqueous NaOH is
Choose the correct answer from the options given below.
1 A > B > D > C
2 D > C > B > A
3 D > B > A > C
4 C > A > D > B
Explanation:
SN reaction in chlorobenzene increases by the presence of an EWG at ortho and para positions with respect to chlorine. Stronger thestrength of the EWG, higher the reactivity. Nitro group is a strong EWG. Hence, the correct order of nucleophilic substitution will be \(\mathrm{D}>\mathrm{B}>\mathrm{A}>\mathrm{C}\).
