QBManager

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317457 Assertion :
supporting img
Reason :
It follows with the formation of more stable carbocation.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317458 Which one of the following species is most stable?

1

p - O_{2} N - C_{6} H_{4} - \overset{+}{C} H_{2}

2

p - {CH}_{3} O - C_{6} H_{4} - \overset{+}{C} H_{2}

3

p - Cl - C_{6} H_{4} - \overset{+}{C} H_{2}

4

C_{6} H_{5} - \overset{+}{C} H_{2}

Explanation:

supporting img
Nitro-group is electron withdrawing; therefore decrease stability.

Methoxy group is electron releasing; therefore increases stability by donating electron.

Chlorine is also electron withdrawing but its effect is less than - ${NO}_{2}$ group. Hence, the correct order of stability is
supporting img

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317459 Which among the following carbocation is most reactive?

1

{CH}_{3}^{+}

2

{CH}_{3} - {CH}_{2}^{+}

3

{({CH}_{3})}_{2} {CH}^{+}

4

{({CH}_{3})}_{3} C^{+}

Explanation:

${CH}_{3}^{+}$ carbocation is most reactive, because order of stability of carbocation due to hyperconjugation and inductive effect is, $3^{\circ}$ carbocation $> 2^{\circ}$ carbocation $> 1^{\circ}$ carbocation. So, $1^{\circ}$ carbocation is least stable due to this, it is most reactive.

MHTCET - 2020

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317460 Among the following the most stable free radical is.

1

{CH}_{3} \dot{C} H_{2}

2

{CH}_{3} \dot{C} {HCH}_{3}

3

{CH}_{3} \dot{C} {HC}_{6} H_{5}

4

C_{6} H_{5} {CH}_{2} \dot{C} H_{2}

Explanation:

${CH}_{3} \dot{C} {HC}_{6} H_{5}$ is most stable free radical due to resonance and $+ I$ -effect.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317477 The false statements among the following are
(i) A primary carbocations is less stable than a tertiary carbocation
(ii) A secondary propyl carbocation is less stable than allyl carbocation
(iii) A tertiary free radical is more stable than a primary free radical
(iv) An isopropyl carbanion is more stable than ethyl carbanion

1 (i) and (ii)

2 (ii) only

3 (i) and (iv)

4 (iv) only

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317457 Assertion :
supporting img
Reason :
It follows with the formation of more stable carbocation.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317458 Which one of the following species is most stable?

1

p - O_{2} N - C_{6} H_{4} - \overset{+}{C} H_{2}

2

p - {CH}_{3} O - C_{6} H_{4} - \overset{+}{C} H_{2}

3

p - Cl - C_{6} H_{4} - \overset{+}{C} H_{2}

4

C_{6} H_{5} - \overset{+}{C} H_{2}

Explanation:

supporting img
Nitro-group is electron withdrawing; therefore decrease stability.

Methoxy group is electron releasing; therefore increases stability by donating electron.

Chlorine is also electron withdrawing but its effect is less than - ${NO}_{2}$ group. Hence, the correct order of stability is
supporting img

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317459 Which among the following carbocation is most reactive?

1

{CH}_{3}^{+}

2

{CH}_{3} - {CH}_{2}^{+}

3

{({CH}_{3})}_{2} {CH}^{+}

4

{({CH}_{3})}_{3} C^{+}

Explanation:

${CH}_{3}^{+}$ carbocation is most reactive, because order of stability of carbocation due to hyperconjugation and inductive effect is, $3^{\circ}$ carbocation $> 2^{\circ}$ carbocation $> 1^{\circ}$ carbocation. So, $1^{\circ}$ carbocation is least stable due to this, it is most reactive.

MHTCET - 2020

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317460 Among the following the most stable free radical is.

1

{CH}_{3} \dot{C} H_{2}

2

{CH}_{3} \dot{C} {HCH}_{3}

3

{CH}_{3} \dot{C} {HC}_{6} H_{5}

4

C_{6} H_{5} {CH}_{2} \dot{C} H_{2}

Explanation:

${CH}_{3} \dot{C} {HC}_{6} H_{5}$ is most stable free radical due to resonance and $+ I$ -effect.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317477 The false statements among the following are
(i) A primary carbocations is less stable than a tertiary carbocation
(ii) A secondary propyl carbocation is less stable than allyl carbocation
(iii) A tertiary free radical is more stable than a primary free radical
(iv) An isopropyl carbanion is more stable than ethyl carbanion

1 (i) and (ii)

2 (ii) only

3 (i) and (iv)

4 (iv) only

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317457 Assertion :
supporting img
Reason :
It follows with the formation of more stable carbocation.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317458 Which one of the following species is most stable?

1

p - O_{2} N - C_{6} H_{4} - \overset{+}{C} H_{2}

2

p - {CH}_{3} O - C_{6} H_{4} - \overset{+}{C} H_{2}

3

p - Cl - C_{6} H_{4} - \overset{+}{C} H_{2}

4

C_{6} H_{5} - \overset{+}{C} H_{2}

Explanation:

supporting img
Nitro-group is electron withdrawing; therefore decrease stability.

Methoxy group is electron releasing; therefore increases stability by donating electron.

Chlorine is also electron withdrawing but its effect is less than - ${NO}_{2}$ group. Hence, the correct order of stability is
supporting img

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317459 Which among the following carbocation is most reactive?

1

{CH}_{3}^{+}

2

{CH}_{3} - {CH}_{2}^{+}

3

{({CH}_{3})}_{2} {CH}^{+}

4

{({CH}_{3})}_{3} C^{+}

Explanation:

${CH}_{3}^{+}$ carbocation is most reactive, because order of stability of carbocation due to hyperconjugation and inductive effect is, $3^{\circ}$ carbocation $> 2^{\circ}$ carbocation $> 1^{\circ}$ carbocation. So, $1^{\circ}$ carbocation is least stable due to this, it is most reactive.

MHTCET - 2020

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317460 Among the following the most stable free radical is.

1

{CH}_{3} \dot{C} H_{2}

2

{CH}_{3} \dot{C} {HCH}_{3}

3

{CH}_{3} \dot{C} {HC}_{6} H_{5}

4

C_{6} H_{5} {CH}_{2} \dot{C} H_{2}

Explanation:

${CH}_{3} \dot{C} {HC}_{6} H_{5}$ is most stable free radical due to resonance and $+ I$ -effect.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317477 The false statements among the following are
(i) A primary carbocations is less stable than a tertiary carbocation
(ii) A secondary propyl carbocation is less stable than allyl carbocation
(iii) A tertiary free radical is more stable than a primary free radical
(iv) An isopropyl carbanion is more stable than ethyl carbanion

1 (i) and (ii)

2 (ii) only

3 (i) and (iv)

4 (iv) only

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317457 Assertion :
supporting img
Reason :
It follows with the formation of more stable carbocation.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317458 Which one of the following species is most stable?

1

p - O_{2} N - C_{6} H_{4} - \overset{+}{C} H_{2}

2

p - {CH}_{3} O - C_{6} H_{4} - \overset{+}{C} H_{2}

3

p - Cl - C_{6} H_{4} - \overset{+}{C} H_{2}

4

C_{6} H_{5} - \overset{+}{C} H_{2}

Explanation:

supporting img
Nitro-group is electron withdrawing; therefore decrease stability.

Methoxy group is electron releasing; therefore increases stability by donating electron.

Chlorine is also electron withdrawing but its effect is less than - ${NO}_{2}$ group. Hence, the correct order of stability is
supporting img

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317459 Which among the following carbocation is most reactive?

1

{CH}_{3}^{+}

2

{CH}_{3} - {CH}_{2}^{+}

3

{({CH}_{3})}_{2} {CH}^{+}

4

{({CH}_{3})}_{3} C^{+}

Explanation:

${CH}_{3}^{+}$ carbocation is most reactive, because order of stability of carbocation due to hyperconjugation and inductive effect is, $3^{\circ}$ carbocation $> 2^{\circ}$ carbocation $> 1^{\circ}$ carbocation. So, $1^{\circ}$ carbocation is least stable due to this, it is most reactive.

MHTCET - 2020

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317460 Among the following the most stable free radical is.

1

{CH}_{3} \dot{C} H_{2}

2

{CH}_{3} \dot{C} {HCH}_{3}

3

{CH}_{3} \dot{C} {HC}_{6} H_{5}

4

C_{6} H_{5} {CH}_{2} \dot{C} H_{2}

Explanation:

${CH}_{3} \dot{C} {HC}_{6} H_{5}$ is most stable free radical due to resonance and $+ I$ -effect.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317477 The false statements among the following are
(i) A primary carbocations is less stable than a tertiary carbocation
(ii) A secondary propyl carbocation is less stable than allyl carbocation
(iii) A tertiary free radical is more stable than a primary free radical
(iv) An isopropyl carbanion is more stable than ethyl carbanion

1 (i) and (ii)

2 (ii) only

3 (i) and (iv)

4 (iv) only

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317457 Assertion :
supporting img
Reason :
It follows with the formation of more stable carbocation.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317458 Which one of the following species is most stable?

1

p - O_{2} N - C_{6} H_{4} - \overset{+}{C} H_{2}

2

p - {CH}_{3} O - C_{6} H_{4} - \overset{+}{C} H_{2}

3

p - Cl - C_{6} H_{4} - \overset{+}{C} H_{2}

4

C_{6} H_{5} - \overset{+}{C} H_{2}

Explanation:

supporting img
Nitro-group is electron withdrawing; therefore decrease stability.

Methoxy group is electron releasing; therefore increases stability by donating electron.

Chlorine is also electron withdrawing but its effect is less than - ${NO}_{2}$ group. Hence, the correct order of stability is
supporting img

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317459 Which among the following carbocation is most reactive?

1

{CH}_{3}^{+}

2

{CH}_{3} - {CH}_{2}^{+}

3

{({CH}_{3})}_{2} {CH}^{+}

4

{({CH}_{3})}_{3} C^{+}

Explanation:

${CH}_{3}^{+}$ carbocation is most reactive, because order of stability of carbocation due to hyperconjugation and inductive effect is, $3^{\circ}$ carbocation $> 2^{\circ}$ carbocation $> 1^{\circ}$ carbocation. So, $1^{\circ}$ carbocation is least stable due to this, it is most reactive.

MHTCET - 2020

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317460 Among the following the most stable free radical is.

1

{CH}_{3} \dot{C} H_{2}

2

{CH}_{3} \dot{C} {HCH}_{3}

3

{CH}_{3} \dot{C} {HC}_{6} H_{5}

4

C_{6} H_{5} {CH}_{2} \dot{C} H_{2}

Explanation:

${CH}_{3} \dot{C} {HC}_{6} H_{5}$ is most stable free radical due to resonance and $+ I$ -effect.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317477 The false statements among the following are
(i) A primary carbocations is less stable than a tertiary carbocation
(ii) A secondary propyl carbocation is less stable than allyl carbocation
(iii) A tertiary free radical is more stable than a primary free radical
(iv) An isopropyl carbanion is more stable than ethyl carbanion

1 (i) and (ii)

2 (ii) only

3 (i) and (iv)

4 (iv) only

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Question Bank Series

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation: