90847
The order of decreasing reactivity towards an electrophilic reagent, for the following compounds, is I. Benzene II. Toluene III. Chlorobenzene IV. Phenol
1 I $>$ II $>$ III $>$ IV
2 II $>$ IV $>$ I $>$ III
3 IV $>$ III $>$ II $>$ I
4 IV $>$ II $>$ I $>$ III
Explanation:
The structure of compound are given below I. II. III. IV. As we know that electrophile attack that position in which the electron density will be more. $\mathrm{CH}_{3}, \mathrm{OH}$ are ring activating group. It increases electron density on benzene ring that's why it has more reactivity towards electrophilic reagent. So, the overall electrophilic reagent towards reactivity as given below:- Phenol (IV) > Toluene (II) > Benzene (I) > Chlorobenezene (III)
Shift-II]**
HALOALKANES AND HALOARENES
90849
The order of reactivity of the following compounds towards dilute aqueous $\mathrm{KOH}$ in $S_{N} 1$ reaction is
1 I $<$ IV $<$ III $<$ II
2 IV $<$ II $<$ III $<$ I
3 III $<$ II $<$ I $<$ IV
4 I $<$ III $<$ II $<$ IV
Explanation:
When these compound are react towards aqueous $\mathrm{KOH}$ it is a nucleophilic substitution reaction which result in formation of carbocation. Stability of carbocation is $3^{\circ}>2^{\circ}>1^{\circ}$ So, the correct option is I $<$ III $<$ II $<$ IV
Shift-II]**
HALOALKANES AND HALOARENES
90853
Assertion: $\mathrm{S}_{\mathrm{N}} 2$ reaction of an optically active aryl halide with an aqueous solution of $\mathrm{KOH}$ always gives an alcohol with opposite sign of rotation. Reason: $S_{N} 2$ reaction always proceed with retention of configuration.
1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
Assertion is False, because aryl halide do not undergo nucleophilic substitution under ordinary condition this is due to resonance, because of which the carbon-chlorine bond acquires partial double bond character, hence it becomes shorter and stronger and thus cannot be replace by nucleophiles. Also, reason is false $\mathrm{S}_{\mathrm{N}} 2$ reaction product with inversion of configuration.
2013
HALOALKANES AND HALOARENES
90864
The decreasing order of reactivity of the following organic molecules towards $\mathrm{AgNO}_{3}$ solution is :
1 (A) $>$ (B) $>$ (C) $>$ (D)
2 (C) $>$ (D) $>$ (A) $>$ (B)
3 (B) $>$ (A) $>$ (C) $>$ (D)
4 (A) $>$ (B) $>$ (D) $>$ (C)
Explanation:
(a) (b) (C) (D) Stability of carbocation- $\mathrm{B}>\mathrm{A}>\mathrm{C}>\mathrm{D}$.
NEET Test Series from KOTA - 10 Papers In MS WORD
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HALOALKANES AND HALOARENES
90847
The order of decreasing reactivity towards an electrophilic reagent, for the following compounds, is I. Benzene II. Toluene III. Chlorobenzene IV. Phenol
1 I $>$ II $>$ III $>$ IV
2 II $>$ IV $>$ I $>$ III
3 IV $>$ III $>$ II $>$ I
4 IV $>$ II $>$ I $>$ III
Explanation:
The structure of compound are given below I. II. III. IV. As we know that electrophile attack that position in which the electron density will be more. $\mathrm{CH}_{3}, \mathrm{OH}$ are ring activating group. It increases electron density on benzene ring that's why it has more reactivity towards electrophilic reagent. So, the overall electrophilic reagent towards reactivity as given below:- Phenol (IV) > Toluene (II) > Benzene (I) > Chlorobenezene (III)
Shift-II]**
HALOALKANES AND HALOARENES
90849
The order of reactivity of the following compounds towards dilute aqueous $\mathrm{KOH}$ in $S_{N} 1$ reaction is
1 I $<$ IV $<$ III $<$ II
2 IV $<$ II $<$ III $<$ I
3 III $<$ II $<$ I $<$ IV
4 I $<$ III $<$ II $<$ IV
Explanation:
When these compound are react towards aqueous $\mathrm{KOH}$ it is a nucleophilic substitution reaction which result in formation of carbocation. Stability of carbocation is $3^{\circ}>2^{\circ}>1^{\circ}$ So, the correct option is I $<$ III $<$ II $<$ IV
Shift-II]**
HALOALKANES AND HALOARENES
90853
Assertion: $\mathrm{S}_{\mathrm{N}} 2$ reaction of an optically active aryl halide with an aqueous solution of $\mathrm{KOH}$ always gives an alcohol with opposite sign of rotation. Reason: $S_{N} 2$ reaction always proceed with retention of configuration.
1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
Assertion is False, because aryl halide do not undergo nucleophilic substitution under ordinary condition this is due to resonance, because of which the carbon-chlorine bond acquires partial double bond character, hence it becomes shorter and stronger and thus cannot be replace by nucleophiles. Also, reason is false $\mathrm{S}_{\mathrm{N}} 2$ reaction product with inversion of configuration.
2013
HALOALKANES AND HALOARENES
90864
The decreasing order of reactivity of the following organic molecules towards $\mathrm{AgNO}_{3}$ solution is :
1 (A) $>$ (B) $>$ (C) $>$ (D)
2 (C) $>$ (D) $>$ (A) $>$ (B)
3 (B) $>$ (A) $>$ (C) $>$ (D)
4 (A) $>$ (B) $>$ (D) $>$ (C)
Explanation:
(a) (b) (C) (D) Stability of carbocation- $\mathrm{B}>\mathrm{A}>\mathrm{C}>\mathrm{D}$.
90847
The order of decreasing reactivity towards an electrophilic reagent, for the following compounds, is I. Benzene II. Toluene III. Chlorobenzene IV. Phenol
1 I $>$ II $>$ III $>$ IV
2 II $>$ IV $>$ I $>$ III
3 IV $>$ III $>$ II $>$ I
4 IV $>$ II $>$ I $>$ III
Explanation:
The structure of compound are given below I. II. III. IV. As we know that electrophile attack that position in which the electron density will be more. $\mathrm{CH}_{3}, \mathrm{OH}$ are ring activating group. It increases electron density on benzene ring that's why it has more reactivity towards electrophilic reagent. So, the overall electrophilic reagent towards reactivity as given below:- Phenol (IV) > Toluene (II) > Benzene (I) > Chlorobenezene (III)
Shift-II]**
HALOALKANES AND HALOARENES
90849
The order of reactivity of the following compounds towards dilute aqueous $\mathrm{KOH}$ in $S_{N} 1$ reaction is
1 I $<$ IV $<$ III $<$ II
2 IV $<$ II $<$ III $<$ I
3 III $<$ II $<$ I $<$ IV
4 I $<$ III $<$ II $<$ IV
Explanation:
When these compound are react towards aqueous $\mathrm{KOH}$ it is a nucleophilic substitution reaction which result in formation of carbocation. Stability of carbocation is $3^{\circ}>2^{\circ}>1^{\circ}$ So, the correct option is I $<$ III $<$ II $<$ IV
Shift-II]**
HALOALKANES AND HALOARENES
90853
Assertion: $\mathrm{S}_{\mathrm{N}} 2$ reaction of an optically active aryl halide with an aqueous solution of $\mathrm{KOH}$ always gives an alcohol with opposite sign of rotation. Reason: $S_{N} 2$ reaction always proceed with retention of configuration.
1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
Assertion is False, because aryl halide do not undergo nucleophilic substitution under ordinary condition this is due to resonance, because of which the carbon-chlorine bond acquires partial double bond character, hence it becomes shorter and stronger and thus cannot be replace by nucleophiles. Also, reason is false $\mathrm{S}_{\mathrm{N}} 2$ reaction product with inversion of configuration.
2013
HALOALKANES AND HALOARENES
90864
The decreasing order of reactivity of the following organic molecules towards $\mathrm{AgNO}_{3}$ solution is :
1 (A) $>$ (B) $>$ (C) $>$ (D)
2 (C) $>$ (D) $>$ (A) $>$ (B)
3 (B) $>$ (A) $>$ (C) $>$ (D)
4 (A) $>$ (B) $>$ (D) $>$ (C)
Explanation:
(a) (b) (C) (D) Stability of carbocation- $\mathrm{B}>\mathrm{A}>\mathrm{C}>\mathrm{D}$.
90847
The order of decreasing reactivity towards an electrophilic reagent, for the following compounds, is I. Benzene II. Toluene III. Chlorobenzene IV. Phenol
1 I $>$ II $>$ III $>$ IV
2 II $>$ IV $>$ I $>$ III
3 IV $>$ III $>$ II $>$ I
4 IV $>$ II $>$ I $>$ III
Explanation:
The structure of compound are given below I. II. III. IV. As we know that electrophile attack that position in which the electron density will be more. $\mathrm{CH}_{3}, \mathrm{OH}$ are ring activating group. It increases electron density on benzene ring that's why it has more reactivity towards electrophilic reagent. So, the overall electrophilic reagent towards reactivity as given below:- Phenol (IV) > Toluene (II) > Benzene (I) > Chlorobenezene (III)
Shift-II]**
HALOALKANES AND HALOARENES
90849
The order of reactivity of the following compounds towards dilute aqueous $\mathrm{KOH}$ in $S_{N} 1$ reaction is
1 I $<$ IV $<$ III $<$ II
2 IV $<$ II $<$ III $<$ I
3 III $<$ II $<$ I $<$ IV
4 I $<$ III $<$ II $<$ IV
Explanation:
When these compound are react towards aqueous $\mathrm{KOH}$ it is a nucleophilic substitution reaction which result in formation of carbocation. Stability of carbocation is $3^{\circ}>2^{\circ}>1^{\circ}$ So, the correct option is I $<$ III $<$ II $<$ IV
Shift-II]**
HALOALKANES AND HALOARENES
90853
Assertion: $\mathrm{S}_{\mathrm{N}} 2$ reaction of an optically active aryl halide with an aqueous solution of $\mathrm{KOH}$ always gives an alcohol with opposite sign of rotation. Reason: $S_{N} 2$ reaction always proceed with retention of configuration.
1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
Assertion is False, because aryl halide do not undergo nucleophilic substitution under ordinary condition this is due to resonance, because of which the carbon-chlorine bond acquires partial double bond character, hence it becomes shorter and stronger and thus cannot be replace by nucleophiles. Also, reason is false $\mathrm{S}_{\mathrm{N}} 2$ reaction product with inversion of configuration.
2013
HALOALKANES AND HALOARENES
90864
The decreasing order of reactivity of the following organic molecules towards $\mathrm{AgNO}_{3}$ solution is :
1 (A) $>$ (B) $>$ (C) $>$ (D)
2 (C) $>$ (D) $>$ (A) $>$ (B)
3 (B) $>$ (A) $>$ (C) $>$ (D)
4 (A) $>$ (B) $>$ (D) $>$ (C)
Explanation:
(a) (b) (C) (D) Stability of carbocation- $\mathrm{B}>\mathrm{A}>\mathrm{C}>\mathrm{D}$.
