Question

CHE
25.
+ HBr (1 eq.)
40°C
→ X (major).
(1, 4-addition)
Identify X
CH3
CH3
Br
(2)
Br
CH3
tBr
CH3
(3)
(4)
Br
​

Answer 1

HBr Addition With Radical Yields 1-bromoalkene

Syn addition is when both Hydrogens attach to the same face or side of the double bond (i.e. cis) while the anti addition is when they attach on opposite sides of the bond (trans).