For the reaction RCH 2 Br + I - ? Acetone RCH 2 I Major + Br

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Q.
For the reaction

${RCH}_{2} Br + I^{-} \overset{Acetone}{\to} \underset{Major}{{RCH}_{2} I} + {Br}^{-}$

The correct statement is [2023]

1 The transition state formed in the above reaction is less polar than the localised anion.

2 The reaction can occur in acetic acid also.

3 ${Br}^{-}$ can act as competing nucleophile.

4 The solvent used in the reaction solvates the ions formed in the rate-determining step.

Ans.
(1)

The given reaction is a $S_{N} 2$ reaction proceed via transition state mechanism which requires strong nucleophile in non polar or polar aprotic solvent. This medium provides transition state a less polar environment than that of localised anion.

Solution

Q.
For the reaction

${RCH}_{2} Br + I^{-} \overset{Acetone}{\to} \underset{Major}{{RCH}_{2} I} + {Br}^{-}$

The correct statement is [2023]

1 The transition state formed in the above reaction is less polar than the localised anion.

2 The reaction can occur in acetic acid also.

3 ${Br}^{-}$ can act as competing nucleophile.

4 The solvent used in the reaction solvates the ions formed in the rate-determining step.

Ans.
(1)

The given reaction is a $S_{N} 2$ reaction proceed via transition state mechanism which requires strong nucleophile in non polar or polar aprotic solvent. This medium provides transition state a less polar environment than that of localised anion.

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Solution

Q. For the reaction RCH2Br+I-→AcetoneRCH2IMajor+Br- The correct statement is [2023]

1 The transition state formed in the above reaction is less polar than the localised anion.

2 The reaction can occur in acetic acid also.

3 Br- can act as competing nucleophile.

4 The solvent used in the reaction solvates the ions formed in the rate-determining step.

Ans. (1) The given reaction is a SN2 reaction proceed via transition state mechanism which requires strong nucleophile in non polar or polar aprotic solvent. This medium provides transition state a less polar environment than that of localised anion.

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Q.
For the reaction

${RCH}_{2} Br + I^{-} \overset{Acetone}{\to} \underset{Major}{{RCH}_{2} I} + {Br}^{-}$

The correct statement is [2023]

3 ${Br}^{-}$ can act as competing nucleophile.

Ans.
(1)

The given reaction is a $S_{N} 2$ reaction proceed via transition state mechanism which requires strong nucleophile in non polar or polar aprotic solvent. This medium provides transition state a less polar environment than that of localised anion.