Question

What is Bredt's rule?

• A. A double bond cannot be formed at the bridgehead
• B. Double bonds can only be formed at the bridgehead
• C. Double bonds cannot be formed in the molecules having a bridgehead
• D. All of the above

Answer 1

The correct option is A A double bond cannot be formed at the bridgehead

According to Bredt's rule, a bicyclic molecule having bridge, bridge $C$ cannot be $s{p}^2$ hybridised. Therefore, a double bond cannot be formed at the bridgehead.