Question

For the given two reactions, choose the correct option:

• A. Reaction $I$ gives a substitution product whereas reaction $II$ gives an elimination product.
• B. Reaction $I$ gives an elimination product whereas reaction $II$ gives a substitution product.
• C. Both reactions give elimination products.
• D. Both reactions give substitution products.

Answer 1

The correct option is A Reaction $I$ gives a substitution product whereas reaction $II$ gives an elimination product.

Effect of Size of the Base/Nucleophile
When the nucleophile/base is small, it generally substitutes the leaving group and gives a substitution product as shown:
When the nucleophile/base is bulky, it generally abstracts the proton and gives an elimination product as shown:

Here tert-butoxide can not enter the molecule to reach the electrophilic carbon because of bulky nature. So it abstracts the proton