Question

Which alkene gives a racemic mixture upon reaction with $B{r}_2$ in $C{H}_{2}C{l}_2$ ?

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

Halogens like Br, Cl and I add up to alkenes to form vicinal dihalides. Addition of halogens to alkenes​ is an example of electrophilic​ addition reaction. Addition of two substituents to​ multiple bonded C atoms from the ​opposite sides of the multiple bond is known as anti addition. When anti addition takes place to an symmetrical cis alkene, then racemic mixture is formed.

Here only option (a) is symmetrical cis alkene is present. Hence, the correct answer will be option (a).