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Q.
Anti-Markownikoff addition of $HBr$ is not observed in
J & K CETJ & K CET 2012Hydrocarbons
Solution:
Anti-Markownikoff addition is not observed in $2$-butene because both the doubly bonded carbons have same number of hydrogen atoms i.e., the alkene is symmetrical.
$\underset{\text{but} -2-\text{ene}}{H_{3} C-C H=C H-C H_{3}}$