Which step is not feasible in the following loop?

(1) step – a

(2) step – b

(3) step – c

(4) step – d

The product R is :

(1)
(2)
(3)
(4)

The product 'C' is

(1)
(2)
(3)
(4)

The product B is

(1) PhCH = CHCH₂Br

(2)

(3) PhCH₂CH(Br)COOH

(4) PhCH = CH − Cobr

The number of stereoisomeric products formed in the following reaction is

(1) 1

(2) 8

(3) 4

(4) 2

The end products of following reaction would be,

(1)
(2)
(3)
(4)

In which of the following compounds O¹⁸ exchange can be observed on keeping it in H₂O¹⁸

(1)
(2)
(3)
(4)

The possible number of stereoisomers of the product of following reaction would be :

(1) 2

(2) 4

(3) 6

(4) 8

Which of the following ketone recemises in aqueous solution containing some acidic or basic impurities.

(1)
(2)
(3)
(4)

The final product (X) of the following reactions would be

(1)
(2)
(3)
(4)