QBManager

GENERAL ORGANIC CHEMISTRY

231567 Which amongst the following is the most stable carbocation?

1

2

3

\overset{+}{C} H_{3}

4

{CH}_{3} \overset{+}{C} H_{2}

Explanation:

The most stable carbocation is t-alkyl carbocation the order of stability of alkyl carbocation is ter-alkyl $>$ sec $>$ alkyl $>$ pri-alkyl $> {CH}_{3}^{+}$ carbocation. This stability order is described with the help of hyper conjugation and inductive effect.

AIPMT -2005

GENERAL ORGANIC CHEMISTRY

231574 Which of the following group is sharp ortho and para directive?

1

- C_{6} H_{5}

2

- OH

3

{CH}_{3}

4

- Cl

Explanation:

When $C_{6} H_{5}$ attached to other benzene ring the both ring is delocalized and both have $o$ and $p$ directing when $- O - H$ attached to benzene ring it is sharp ortho para directing group because it have free electron to donate in benzene ring.

MHT CET-2012

GENERAL ORGANIC CHEMISTRY

231580 Nucleophilicity is highest for

1

{NH}_{2}^{-}

2

{CH}_{3}^{-}

3

{Cl}^{-}

4

\overset{―}{O} H

Explanation:

A less electronegative atom is more nucleophilic. Thus, nucleophilicity is highest for ${CH}_{3}^{-}$ among the given.

UP CPMT-2014

GENERAL ORGANIC CHEMISTRY

231584 Which one of the following is not a nitro derivative?

1

C_{6} H_{5} {NO}_{6}

2

{CH}_{3} {CH}_{2} ONO

3

4

C_{6} H_{4} (OH) {NO}_{2}

Explanation:

${CH}_{3} {CH}_{2} - O - N = O$ is not a nitro derivative, hence it is a nitrite derivative.

UP CPMT-2012

GENERAL ORGANIC CHEMISTRY

231567 Which amongst the following is the most stable carbocation?

1

2

3

\overset{+}{C} H_{3}

4

{CH}_{3} \overset{+}{C} H_{2}

Explanation:

The most stable carbocation is t-alkyl carbocation the order of stability of alkyl carbocation is ter-alkyl $>$ sec $>$ alkyl $>$ pri-alkyl $> {CH}_{3}^{+}$ carbocation. This stability order is described with the help of hyper conjugation and inductive effect.

AIPMT -2005

GENERAL ORGANIC CHEMISTRY

231574 Which of the following group is sharp ortho and para directive?

1

- C_{6} H_{5}

2

- OH

3

{CH}_{3}

4

- Cl

Explanation:

When $C_{6} H_{5}$ attached to other benzene ring the both ring is delocalized and both have $o$ and $p$ directing when $- O - H$ attached to benzene ring it is sharp ortho para directing group because it have free electron to donate in benzene ring.

MHT CET-2012

GENERAL ORGANIC CHEMISTRY

231580 Nucleophilicity is highest for

1

{NH}_{2}^{-}

2

{CH}_{3}^{-}

3

{Cl}^{-}

4

\overset{―}{O} H

Explanation:

A less electronegative atom is more nucleophilic. Thus, nucleophilicity is highest for ${CH}_{3}^{-}$ among the given.

UP CPMT-2014

GENERAL ORGANIC CHEMISTRY

231584 Which one of the following is not a nitro derivative?

1

C_{6} H_{5} {NO}_{6}

2

{CH}_{3} {CH}_{2} ONO

3

4

C_{6} H_{4} (OH) {NO}_{2}

Explanation:

${CH}_{3} {CH}_{2} - O - N = O$ is not a nitro derivative, hence it is a nitrite derivative.

UP CPMT-2012

GENERAL ORGANIC CHEMISTRY

231567 Which amongst the following is the most stable carbocation?

1

2

3

\overset{+}{C} H_{3}

4

{CH}_{3} \overset{+}{C} H_{2}

Explanation:

The most stable carbocation is t-alkyl carbocation the order of stability of alkyl carbocation is ter-alkyl $>$ sec $>$ alkyl $>$ pri-alkyl $> {CH}_{3}^{+}$ carbocation. This stability order is described with the help of hyper conjugation and inductive effect.

AIPMT -2005

GENERAL ORGANIC CHEMISTRY

231574 Which of the following group is sharp ortho and para directive?

1

- C_{6} H_{5}

2

- OH

3

{CH}_{3}

4

- Cl

Explanation:

When $C_{6} H_{5}$ attached to other benzene ring the both ring is delocalized and both have $o$ and $p$ directing when $- O - H$ attached to benzene ring it is sharp ortho para directing group because it have free electron to donate in benzene ring.

MHT CET-2012

GENERAL ORGANIC CHEMISTRY

231580 Nucleophilicity is highest for

1

{NH}_{2}^{-}

2

{CH}_{3}^{-}

3

{Cl}^{-}

4

\overset{―}{O} H

Explanation:

A less electronegative atom is more nucleophilic. Thus, nucleophilicity is highest for ${CH}_{3}^{-}$ among the given.

UP CPMT-2014

GENERAL ORGANIC CHEMISTRY

231584 Which one of the following is not a nitro derivative?

1

C_{6} H_{5} {NO}_{6}

2

{CH}_{3} {CH}_{2} ONO

3

4

C_{6} H_{4} (OH) {NO}_{2}

Explanation:

${CH}_{3} {CH}_{2} - O - N = O$ is not a nitro derivative, hence it is a nitrite derivative.

UP CPMT-2012

GENERAL ORGANIC CHEMISTRY

231567 Which amongst the following is the most stable carbocation?

1

2

3

\overset{+}{C} H_{3}

4

{CH}_{3} \overset{+}{C} H_{2}

Explanation:

The most stable carbocation is t-alkyl carbocation the order of stability of alkyl carbocation is ter-alkyl $>$ sec $>$ alkyl $>$ pri-alkyl $> {CH}_{3}^{+}$ carbocation. This stability order is described with the help of hyper conjugation and inductive effect.

AIPMT -2005

GENERAL ORGANIC CHEMISTRY

231574 Which of the following group is sharp ortho and para directive?

1

- C_{6} H_{5}

2

- OH

3

{CH}_{3}

4

- Cl

Explanation:

When $C_{6} H_{5}$ attached to other benzene ring the both ring is delocalized and both have $o$ and $p$ directing when $- O - H$ attached to benzene ring it is sharp ortho para directing group because it have free electron to donate in benzene ring.

MHT CET-2012

GENERAL ORGANIC CHEMISTRY

231580 Nucleophilicity is highest for

1

{NH}_{2}^{-}

2

{CH}_{3}^{-}

3

{Cl}^{-}

4

\overset{―}{O} H

Explanation:

A less electronegative atom is more nucleophilic. Thus, nucleophilicity is highest for ${CH}_{3}^{-}$ among the given.

UP CPMT-2014

GENERAL ORGANIC CHEMISTRY

231584 Which one of the following is not a nitro derivative?

1

C_{6} H_{5} {NO}_{6}

2

{CH}_{3} {CH}_{2} ONO

3

4

C_{6} H_{4} (OH) {NO}_{2}

Explanation:

${CH}_{3} {CH}_{2} - O - N = O$ is not a nitro derivative, hence it is a nitrite derivative.

UP CPMT-2012