Question

What is the main product of the reaction between 2-methylpropene with. HBR ?

Answer 1

Let us first look at the compounds mentioned in the question.

2-methylpropane, or $HC(CH_3)_3$, is also called Isobutane/i-butane/methylpropane. An isomer of butane, 2-methylpropane is the simplest form of alkane which has a tertiary carbon.

On the other hand, Hydrogen Bromide (HBr), a diatomic molecule, is a colourless compound, as well as a hydrogen halide.

Taking into account the chemical properties of the two compounds; as with every reaction with HBr, quaternary carbocation comes into being, resulting in the formation of tert-butyl bromide/2-Bromo-2-methylpropane.