Chemistry - Halogen Derivative Question with Solution | TestHub

Oxidation of a tertiary amine with a peroxide (mCPBA) forms an N-oxide that undergoes an intramolecular deprotonation with syn-stereoselectivity upon heating. This reaction is known as a Cope elimination. This deprotonation will occur on a less hindered beta-carbon, giving rise to a less substituted alkene product (this regioselectivity, known as the Hofmann's rule, is the opposite predicted by Zaitsev's rule).
Hofmann's  β-elimination by abstraction of  β  H-atom from C which is least substituted.