A) Addition of HBr on 2-butene gives two isomeric products.
R) Addition of HBr on 2-butene follows Markownikoff's rule.

(A) Addition of HBr on but-2-ene gives two structural isomeric products (R) Addition of HBr on but-2-ene follows Markownikoff's rule.

Addition of Br_2 on cis-butene-2 gives:

The addition of HBr to 2-pentene gives

Addition of Br_2 on trans-butene-2 gives:

The addition of HBr on butene-2 is an example of:

The number of stereoisomeric products obtained by the addition of HBr to 2-butene