Complete the following reactions:

Explanation

a.
b.
c. Due to EWG(-COOH group), electromeric effect takes place from `C-3` to `C-2`.

d. Due to EWG(-NO_2 group), electromeric effect takes place from `C-2` to `C-1`.

e. Proceed reverse: Position of `(C-=C)` can be on either side of group.

Therefore, (A) (3-Methyl but 1-yne)
f. Proceed reverse:

(A) is symmetrical internal alkyne which would give product (B) only. But `(A_1)` is unsymmetrical internal alkyne which would give two products (B) and `(B_1)`.