Bromination of Alkene

Q.

$H_{3}C-C{H}_2-\underset{\stackrel{|}{C{H}_3}}{C}=C{H}_2+HBr\to A$
A (predominantly) is

1. $C{H}_{3}C{H}_2-\underset{\stackrel{|}{C{H}_3}}{C}H-C{H}_{2}Br$

2. $C{H}_3-CH-\underset{\stackrel{|}{C{H}_3}}{C}H-\underset{\stackrel{|}{Br}}{C{H}_3}$

3. $C{H}_3-CH-\underset{\stackrel{|}{C{H}_3}}{C}H-C{H}_2-C{H}_{2}Br$

4. $C{H}_3-\stackrel{\underset{|}{Br}}{\underset{\stackrel{|}{C{H}_3}}{C}}-C{H}_{2}C{H}_3$

Q. 71 Both propene and cyclopropane undergo addition reaction. True or False?

Q.

$H_{3}C-C{H}_2-\underset{\stackrel{|}{C{H}_3}}{C}=C{H}_2+HBr\to A$
A (predominantly) is

1. $C{H}_{3}C{H}_2-\underset{\stackrel{|}{C{H}_3}}{C}H-C{H}_{2}Br$

2. $C{H}_3-CH-\underset{\stackrel{|}{C{H}_3}}{C}H-\underset{\stackrel{|}{Br}}{C{H}_3}$

3. $C{H}_3-CH-\underset{\stackrel{|}{C{H}_3}}{C}H-C{H}_2-C{H}_{2}Br$

4. $C{H}_3-\stackrel{\underset{|}{Br}}{\underset{\stackrel{|}{C{H}_3}}{C}}-C{H}_{2}C{H}_3$

Q. In methyl alcohol solution, bromine reacts with ethylene to yield $BrC{H}_{2}C{H}_{2}OC{H}_3$ in addition to 1, 2-dibromoethane because

1. The ion formed initially may react with $B{r}^{-}$ or $C{H}_{3}OH$
2. The methyl alcohol solvates the bromine
3. The reaction follows Markownikoff's rule
4. This is a free-radical mechanism