The addition of a hydrogen halide to 2-methyl-2-pentene follows Markovnikov's rule, where the hydrogen atom attaches to the carbon atom with the fewer alkyl groups. In this case, the reaction would involve the addition of a hydrogen halide (such as HCl or HBr) to the double bond of 2-methyl-2-pentene.
The reaction equation for the addition of HBr to 2-methyl-2-pentene would be:
2-methyl-2-pentene + HBr → 2-bromo-2-methylpentane
Here is the structural formula for 2-methyl-2-pentene before and after the addition of HBr:
Before: CH3 CH3 | | CH3C=CCHCH3
After: CH3 CH3 Br | | | CH3C-CCHCH3
The double bond in 2-methyl-2-pentene is replaced by a single bond, and the bromine atom attaches to the carbon atom that was part of the double bond. The resulting compound is 2-bromo-2-methylpentane.