Question

Name the unsaturated hydrocarbon for which Anti-Markovnikov's rule for the addition of $\mathrm{HBr}$ is not applicable.

Answer 1

Anti-Markovnikov' rule:

1. In organic chemistry, the Anti Markovnikov mechanism is one of the few reactions that use free-radical processes instead of electrophilic addition. Only causes this effect (Hydrogen Bromide).
2. The Anti-Markovnikov rule explains how a substituent gets linked to a less substituted carbon rather than a more substituted carbon.
3. Because carbon cations formed during alkene or alkyne reactions prefer the more substituted carbon, this approach is unique.
4. Because the ligands attached to double-bonded carbon are different in unsymmetrical alkenes, the Anti-Markovnikov rule and the Markovnikov rule apply.
5. As a result, the product formed from both sides of the double bond will be different. This rule is used to determine which of two products is the major one. Example:
6. Anti-rule Markovnikov's for the addition of $\mathrm{HBr}$ does not apply to symmetrical alkenes because the ligands bonded on both the sides of double-bonded carbon are the same, hence the product formed will be the same and will be the major product.

Therefore, Anti-Markovnikov's rule for the addition of HBr is not applicable for symmetrical alkenes.