318228
Function of \(\mathrm{AlCl}_{3}\) in Friedel-Craft's reaction is to
1 produce nucleophile
2 make new bond
3 produce electrophile
4 break bond
Explanation:
Function of \({\rm{AlC}}{{\rm{l}}_{\rm{3}}}\) in Friedel craft's reaction is to produce electrophile. The mechanism is followed
CHXI13:HYDROCARBONS
318229
Correct order of electrophillic substitution reaction is
1 A \(>\) B \(>\) C \(>\) D
2 D \(>\) B \(>\) A \(>\) C
3 B \(>\) A \(>\) C \(>\) D
4 B \(>\) A \(>\) D \(>\) C
Explanation:
Electron donating group when bonded with benzene ring will activate the ring due to \((+\mathrm{I})\) effect and show better electrophilic substitution reaction, whereas electron withdrawing groups show \((- \mathrm{I})\) effect, will decreases the nature of electrophilic substitution (1) Here, alkyl group (i.e. \(-\mathrm{CH}_{3}\) ) show \((+\mathrm{I})\) effect, but lesser than \(-\mathrm{OCH}_{3}\) due to presence of oxygen atom, thus \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{OCH}_{3}\) show better electrophilic substitution than that of \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}_{3}\). (2) Chlorine, i.e. \(\mathrm{Cl}\) show \(-\mathrm{I}\) and \(+\mathrm{R}\) effect due to presence of lone pair of electrons, while \(-\mathrm{CHO}\) group is of \((-\mathrm{R})\) nature. thus, \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{Cl}\) show more electrophilic substitution than that of \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CHO}\). Groups showing \((+\mathrm{I})\) and \((+\mathrm{R})\) effect have more electrophilic substitution tendency than those that show either or \((-\mathrm{I})\) and \((+\mathrm{R})\) effect. Hence, correct order is \(\mathrm{B}>\mathrm{A}>\mathrm{C}>\mathrm{D}\) and option (3) is the correct.
AIIMS - 2019
CHXI13:HYDROCARBONS
318230
The electrophile involved in the sulphonation of benzene is
1 \(\mathrm{SO}_{3}^{2-}\)
2 \(\mathrm{H}_{3} \mathrm{O}^{+}\)
3 \(\mathrm{SO}_{3}\)
4 \(\mathrm{SO}_{3}^{+}\)
Explanation:
The sulphonation of benzene invovles the formation of the electrophile, \(\mathrm{SO}_{3}\), in the first step which subsequently attacks the benzene ring and causes sulphonation. Benzene shows electrophilic substitution reaction. \(2 \mathrm{H}_{2} \mathrm{SO}_{4} \rightleftharpoons \mathrm{H}_{3} \mathrm{O}^{+}+\mathrm{HSO}_{4}^{-}+\underset{\text { (Electrophile) }}{\mathrm{SO}_{3}}\)
KCET - 2009
CHXI13:HYDROCARBONS
318231
The treatment of benzene with iso-butene in the presence of sulphuric acid gives.
1 iso - butyl benzene
2 tert-butyl benzene
3 n-butyl benzene
4 No reaction
Explanation:
Benzene reacts with iso-butene in the presence of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) to produce \(\mathrm{t}\)-butyl benzene. The reaction takes place as follows :
318228
Function of \(\mathrm{AlCl}_{3}\) in Friedel-Craft's reaction is to
1 produce nucleophile
2 make new bond
3 produce electrophile
4 break bond
Explanation:
Function of \({\rm{AlC}}{{\rm{l}}_{\rm{3}}}\) in Friedel craft's reaction is to produce electrophile. The mechanism is followed
CHXI13:HYDROCARBONS
318229
Correct order of electrophillic substitution reaction is
1 A \(>\) B \(>\) C \(>\) D
2 D \(>\) B \(>\) A \(>\) C
3 B \(>\) A \(>\) C \(>\) D
4 B \(>\) A \(>\) D \(>\) C
Explanation:
Electron donating group when bonded with benzene ring will activate the ring due to \((+\mathrm{I})\) effect and show better electrophilic substitution reaction, whereas electron withdrawing groups show \((- \mathrm{I})\) effect, will decreases the nature of electrophilic substitution (1) Here, alkyl group (i.e. \(-\mathrm{CH}_{3}\) ) show \((+\mathrm{I})\) effect, but lesser than \(-\mathrm{OCH}_{3}\) due to presence of oxygen atom, thus \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{OCH}_{3}\) show better electrophilic substitution than that of \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}_{3}\). (2) Chlorine, i.e. \(\mathrm{Cl}\) show \(-\mathrm{I}\) and \(+\mathrm{R}\) effect due to presence of lone pair of electrons, while \(-\mathrm{CHO}\) group is of \((-\mathrm{R})\) nature. thus, \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{Cl}\) show more electrophilic substitution than that of \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CHO}\). Groups showing \((+\mathrm{I})\) and \((+\mathrm{R})\) effect have more electrophilic substitution tendency than those that show either or \((-\mathrm{I})\) and \((+\mathrm{R})\) effect. Hence, correct order is \(\mathrm{B}>\mathrm{A}>\mathrm{C}>\mathrm{D}\) and option (3) is the correct.
AIIMS - 2019
CHXI13:HYDROCARBONS
318230
The electrophile involved in the sulphonation of benzene is
1 \(\mathrm{SO}_{3}^{2-}\)
2 \(\mathrm{H}_{3} \mathrm{O}^{+}\)
3 \(\mathrm{SO}_{3}\)
4 \(\mathrm{SO}_{3}^{+}\)
Explanation:
The sulphonation of benzene invovles the formation of the electrophile, \(\mathrm{SO}_{3}\), in the first step which subsequently attacks the benzene ring and causes sulphonation. Benzene shows electrophilic substitution reaction. \(2 \mathrm{H}_{2} \mathrm{SO}_{4} \rightleftharpoons \mathrm{H}_{3} \mathrm{O}^{+}+\mathrm{HSO}_{4}^{-}+\underset{\text { (Electrophile) }}{\mathrm{SO}_{3}}\)
KCET - 2009
CHXI13:HYDROCARBONS
318231
The treatment of benzene with iso-butene in the presence of sulphuric acid gives.
1 iso - butyl benzene
2 tert-butyl benzene
3 n-butyl benzene
4 No reaction
Explanation:
Benzene reacts with iso-butene in the presence of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) to produce \(\mathrm{t}\)-butyl benzene. The reaction takes place as follows :
NEET Test Series from KOTA - 10 Papers In MS WORD
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CHXI13:HYDROCARBONS
318228
Function of \(\mathrm{AlCl}_{3}\) in Friedel-Craft's reaction is to
1 produce nucleophile
2 make new bond
3 produce electrophile
4 break bond
Explanation:
Function of \({\rm{AlC}}{{\rm{l}}_{\rm{3}}}\) in Friedel craft's reaction is to produce electrophile. The mechanism is followed
CHXI13:HYDROCARBONS
318229
Correct order of electrophillic substitution reaction is
1 A \(>\) B \(>\) C \(>\) D
2 D \(>\) B \(>\) A \(>\) C
3 B \(>\) A \(>\) C \(>\) D
4 B \(>\) A \(>\) D \(>\) C
Explanation:
Electron donating group when bonded with benzene ring will activate the ring due to \((+\mathrm{I})\) effect and show better electrophilic substitution reaction, whereas electron withdrawing groups show \((- \mathrm{I})\) effect, will decreases the nature of electrophilic substitution (1) Here, alkyl group (i.e. \(-\mathrm{CH}_{3}\) ) show \((+\mathrm{I})\) effect, but lesser than \(-\mathrm{OCH}_{3}\) due to presence of oxygen atom, thus \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{OCH}_{3}\) show better electrophilic substitution than that of \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}_{3}\). (2) Chlorine, i.e. \(\mathrm{Cl}\) show \(-\mathrm{I}\) and \(+\mathrm{R}\) effect due to presence of lone pair of electrons, while \(-\mathrm{CHO}\) group is of \((-\mathrm{R})\) nature. thus, \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{Cl}\) show more electrophilic substitution than that of \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CHO}\). Groups showing \((+\mathrm{I})\) and \((+\mathrm{R})\) effect have more electrophilic substitution tendency than those that show either or \((-\mathrm{I})\) and \((+\mathrm{R})\) effect. Hence, correct order is \(\mathrm{B}>\mathrm{A}>\mathrm{C}>\mathrm{D}\) and option (3) is the correct.
AIIMS - 2019
CHXI13:HYDROCARBONS
318230
The electrophile involved in the sulphonation of benzene is
1 \(\mathrm{SO}_{3}^{2-}\)
2 \(\mathrm{H}_{3} \mathrm{O}^{+}\)
3 \(\mathrm{SO}_{3}\)
4 \(\mathrm{SO}_{3}^{+}\)
Explanation:
The sulphonation of benzene invovles the formation of the electrophile, \(\mathrm{SO}_{3}\), in the first step which subsequently attacks the benzene ring and causes sulphonation. Benzene shows electrophilic substitution reaction. \(2 \mathrm{H}_{2} \mathrm{SO}_{4} \rightleftharpoons \mathrm{H}_{3} \mathrm{O}^{+}+\mathrm{HSO}_{4}^{-}+\underset{\text { (Electrophile) }}{\mathrm{SO}_{3}}\)
KCET - 2009
CHXI13:HYDROCARBONS
318231
The treatment of benzene with iso-butene in the presence of sulphuric acid gives.
1 iso - butyl benzene
2 tert-butyl benzene
3 n-butyl benzene
4 No reaction
Explanation:
Benzene reacts with iso-butene in the presence of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) to produce \(\mathrm{t}\)-butyl benzene. The reaction takes place as follows :
318228
Function of \(\mathrm{AlCl}_{3}\) in Friedel-Craft's reaction is to
1 produce nucleophile
2 make new bond
3 produce electrophile
4 break bond
Explanation:
Function of \({\rm{AlC}}{{\rm{l}}_{\rm{3}}}\) in Friedel craft's reaction is to produce electrophile. The mechanism is followed
CHXI13:HYDROCARBONS
318229
Correct order of electrophillic substitution reaction is
1 A \(>\) B \(>\) C \(>\) D
2 D \(>\) B \(>\) A \(>\) C
3 B \(>\) A \(>\) C \(>\) D
4 B \(>\) A \(>\) D \(>\) C
Explanation:
Electron donating group when bonded with benzene ring will activate the ring due to \((+\mathrm{I})\) effect and show better electrophilic substitution reaction, whereas electron withdrawing groups show \((- \mathrm{I})\) effect, will decreases the nature of electrophilic substitution (1) Here, alkyl group (i.e. \(-\mathrm{CH}_{3}\) ) show \((+\mathrm{I})\) effect, but lesser than \(-\mathrm{OCH}_{3}\) due to presence of oxygen atom, thus \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{OCH}_{3}\) show better electrophilic substitution than that of \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}_{3}\). (2) Chlorine, i.e. \(\mathrm{Cl}\) show \(-\mathrm{I}\) and \(+\mathrm{R}\) effect due to presence of lone pair of electrons, while \(-\mathrm{CHO}\) group is of \((-\mathrm{R})\) nature. thus, \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{Cl}\) show more electrophilic substitution than that of \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CHO}\). Groups showing \((+\mathrm{I})\) and \((+\mathrm{R})\) effect have more electrophilic substitution tendency than those that show either or \((-\mathrm{I})\) and \((+\mathrm{R})\) effect. Hence, correct order is \(\mathrm{B}>\mathrm{A}>\mathrm{C}>\mathrm{D}\) and option (3) is the correct.
AIIMS - 2019
CHXI13:HYDROCARBONS
318230
The electrophile involved in the sulphonation of benzene is
1 \(\mathrm{SO}_{3}^{2-}\)
2 \(\mathrm{H}_{3} \mathrm{O}^{+}\)
3 \(\mathrm{SO}_{3}\)
4 \(\mathrm{SO}_{3}^{+}\)
Explanation:
The sulphonation of benzene invovles the formation of the electrophile, \(\mathrm{SO}_{3}\), in the first step which subsequently attacks the benzene ring and causes sulphonation. Benzene shows electrophilic substitution reaction. \(2 \mathrm{H}_{2} \mathrm{SO}_{4} \rightleftharpoons \mathrm{H}_{3} \mathrm{O}^{+}+\mathrm{HSO}_{4}^{-}+\underset{\text { (Electrophile) }}{\mathrm{SO}_{3}}\)
KCET - 2009
CHXI13:HYDROCARBONS
318231
The treatment of benzene with iso-butene in the presence of sulphuric acid gives.
1 iso - butyl benzene
2 tert-butyl benzene
3 n-butyl benzene
4 No reaction
Explanation:
Benzene reacts with iso-butene in the presence of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) to produce \(\mathrm{t}\)-butyl benzene. The reaction takes place as follows :
