Question

Anti-Markownikoff addition of $HBr$ is not observed in

• A. propene
• B. butene
• C. $2$-butene
• D. $2$-pentene

Answer 1

Answer: (C)

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.
$\underset{\text{but}-2-\text{ene}}{H_{3}C-CH=CH-C{H}_3}$