Question

What is Markovnikov's rule? Explain with an example?

Answer 1

Markonikoff's rule: When an unsymmetrical reagent is added to an unsymmetrical alkene, the negative part of the reagent is attached to the unsaturated C atom having less number of hydrogen atoms.
Thus, when HBr is added to propene, isopropyl bromide is obtained as major product.
$C{H}_3-CH=C{H}_2+HBr\to C{H}_3-\stackrel{\stackrel{\text{Br}}{|}}{CH}-C{H}_3$
Thus, bromide ion is added to middle carbon atom (having less number of H atoms) and proton is attached to terminal C atom.