Question

Which of the following reactions will give the major and minor products?

CH3 - CH2 - CH – CH3

.ℎ

→ CH3 - CH = CH - CH3 + CH3 - CH2 – CH = CH3



Br A B

a. (A) is major product and (B) is minor product

b. (A) is minor product and (B) is major product

c. Both (A) and (B) are major products

d. Only (B) is formed and (A) is not formed​

Answer 1

Answer:

According to Saytzeff's rule, the more substituted products is more stable and is formed as major product. Hence (A) is major product (80%) while (B) is the minor (20%) and less stable product.

Answer 2

The major and minor products in the given reaction is : a. (A) is major product and (B) is minor product .

• A Major product is the one which is present in more amount whereas minor product is present in the less amount.

• Here, in this reaction the major product is A and the minor product is B. This can be concluded by the saytzeff's rule.

• Saytzeff's rule states that the alkene which is highly substituted is the major product while least substitute alkene is minor product.

CH3 - CH2 - CH – CH3 + alc.KOH /heat→

|

Cl

CH3 - CH = CH - CH3 + CH3 - CH2 – CH = CH2

A. B

• In the A have 6 alpha hydrogen and more substituted so this the major product while B have only 2 alpha hydrogen and less substituted , hence the minore product.