Carbocation Rearrangement - Hydride and Methanide Shifts

Carbocation Rearrangement - Hydride and Methanide Shifts

Assessment

Interactive Video

Chemistry, Science, Biology

11th Grade - University

Hard

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Professor Dave explains carbocation rearrangement, focusing on E1 and SN1 reactions. He discusses the formation of secondary carbocations and the mechanisms of hydride and methanide shifts, emphasizing the stability of more substituted carbocations. The video covers transition states and the role of thermodynamics in these rearrangements.

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7 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the role of a strong acid in the E1 and SN1 reactions?

It stabilizes the carbocation.

It increases the reaction temperature.

It acts as a nucleophile.

It provides a good leaving group.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a hydride shift?

A shift of a water molecule.

A shift of a methyl group with a negative charge.

A shift of a hydrogen atom with a pair of electrons.

A shift of a hydrogen atom with a positive charge.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why does a hydride shift occur?

To generate a more stable carbocation.

To neutralize the solvent.

To create a less stable carbocation.

To increase the reaction rate.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the expected product when a hydride shift occurs in the presence of water?

No reaction occurs.

A single SN1 product.

A racemic mixture of SN1 products.

Only E1 products.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a methanide shift?

A shift of a carbon atom with a positive charge.

A shift of a water molecule.

A shift of a methyl group with a negative charge.

A shift of a hydrogen atom with a positive charge.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What drives the rearrangement in methanide shifts?

Temperature

Pressure

Thermodynamics

Kinetics

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to the carbocation after a methanide shift?

It becomes more stable.

It becomes less stable.

It remains unchanged.

It disappears.