Which of the following carbocation intermediates requires the least activation energy?

Which of the following carbocation intermediates requires the least activation energy?

What intermediate is involved in the conversion of compound B to compound C?

What intermediate is involved in the conversion of compound B to compound C?

Which of the following steps of free radical chlorination does not produce a free radical as a product?

Which of the following steps of free radical chlorination does not produce a free radical as a product?

Which of the following transformations includes an enolate intermediate?

Which of the following transformations includes an enolate intermediate?

If the carbon being pointed to was deprotonated (resulting in a positive charge on it). Would the resonance form (the positive charge being redistributed to the carbon with a bromine) be more stable than a secondary carbocation? Why?

If the carbon being pointed to was deprotonated (resulting in a positive charge on it). Would the resonance form (the positive charge being redistributed to the carbon with a bromine) be more stable than a secondary carbocation? Why?