Answer:
The correct answer is: 3
Step-by-step explanation:
Carbocation, also known as a cationic carbon, is a chemical species in which the carbon atom forms three covalent bonds and has a formal charge of +1. It is an unstable species.
A carbocation in which the cationic carbon is bonded to three hydrogen atoms, is called a methyl carbocation. Carbocations in which the carbon atom is bonded to one carbon group, two carbon groups and three carbon groups is called primary, secondary and tertiary carbocation respectively.