Which of the following reactions is/are correct?
a)
b)
c)
d)

(a,b,d)

a. It is an example of Kolbe''s reaction

So both the products are correct

b. (  + HCl) selectively reduces  group to (  (EDG) group, but ( ) selectively reduces ( ) group to (  (EDG) group. So both the products are correct

c. Due to (+I) effect of three  groups; the benzene the ring is activated and is unstable. So, the oxidation of benzene ring takes place, while due to the absence of benzylic H atom in t-butyl group, the oxidation of side chain does not take place. So the products (II) and (III) are correct, but product (I) is wrong. So the answer (c) is wrong

d. In acidic medium  the ( ) group is reduced to ( ) group. So product (I) is correct. In neutral medium or  group is reduced to (NHOH) group. So product (II) is correct

In basic medium with  ( ) group is converted to azoxy group, so product (III) is correct. Hence, the answers are (a), (b), and (d)