Choose one of the statements below that would best complete the following

sentence. Carbenium ions are made by ...

1. adding protons to olefins.

2. abstracting protons from olefins.

3. adding hydride ions to naphthenes.

4. subtracting hydride ions from olefins.

5. adding electrons to alkane

The correct answer is 4 substracting hydride ions from olefins.

Explanation:

The olefins are the unsaturated hydrocarbon also called alkenes that contain one double bond present between 2 carbon atoms.

On the other hand a carbenium ion is formed when a hydrocarbon loses a hydride ion to form a positively charged product.

For example allyl cation

CH2=CH-CH2+

The allyl cation is a carbenium ion formed by the removal of H - ion or hydride ion from the alkene propene.