Question

Which of the following is not true about the five membered rings?
a) Five membered rings are more stable than 4 membered rings
b) Five membered rings are more stable than 6 membered rings
c) Five membered rings are more stable than 7 membered rings
d) Five membered rings are more stable than 8 membered rings

Answer 1

The correct option is b) Five membered rings are more stable than 6 membered rings

Explanation:

• It is a general rule that a more membered rings are more stable than less membered rings.

• So, according to this rule, five membered rings is more stable than 4 membered rings and less stable than 6 membered rings.

• This is because, rings with more carbon atoms can easily accomodate double bonds, which are more difficult to break and ring becomes more stable.

• Moreover, 5 membered ring can make a 3D structure, making a bond more stable.

• Hence, option b) Five membered rings are more stable than 6 membered rings is correct.