Stability of Carbon Ions and Carbo Cations

The video discusses the stability of carbo cations and carb anions, highlighting that tertiary carbo cations are more stable than secondary and primary ones due to hyper conjugation and inductive effects. Methyl groups, being electron-donating, stabilize carbo cations. In contrast, carb anions are more stable when they are methyl, with stability decreasing from primary to tertiary. Resonance can further stabilize carbon ions by delocalizing the charge over multiple atoms.

Which type of carbo cation is the most stable?

• Secondary carbo cation

• Methyl carbo cation

• Primary carbo cation

• Tertiary carbo cation

What is the primary reason tertiary carbo cations are more stable than primary ones?

• They have more electron-withdrawing groups

• They have a higher molecular weight

• They have fewer carbon atoms attached

• They have more electron-donating groups

What effect involves the donation of electron density through a sigma bond?

• Electromagnetic effect

• Resonance effect

• Inductive effect

• Hyper conjugation effect

How does hyper conjugation stabilize a carbo cation?

• By removing electrons from the cation

• By overlapping orbitals with a nearby C-H bond

• By forming a new pi bond

• By increasing the number of sigma bonds

Which type of carbon ion is the most stable?

• Tertiary carbon ion

• Secondary carbon ion

• Primary carbon ion

• Methyl carbon ion

Why are methyl groups less stabilizing for carbon ions compared to carbo cations?

• They form unstable bonds

• They withdraw electrons, which carbon ions need

• They increase the molecular weight

• They donate electrons, which carbon ions do not need

What makes a secondary allylic carbon ion more stable than a regular secondary carbon ion?

• Higher molecular weight

• Presence of more sigma bonds

• Resonance stabilization

• More electron-withdrawing groups

How does resonance contribute to the stability of carbon ions?

• By localizing the charge on one atom

• By increasing the number of pi bonds

• By decreasing the number of sigma bonds

• By delocalizing the charge over multiple atoms

What happens to the negative charge in a resonance structure of a carbon ion?

• It remains on the same atom

• It is shared between two atoms

• It is transferred to a hydrogen atom

• It is neutralized

Why is it beneficial for a charge to be spread over multiple atoms?

• It increases the energy of the molecule

• It makes the molecule more reactive

• It stabilizes the molecule

• It decreases the molecular weight