Which of the following reactions is//are correct?

Options

A. a.
B. b.
C. c.
D. d.

Answer

A, B, C, D

Explanation

a. `CrO_(3)//MeCOOH`, selectively oxidises `(C=O)` bond, so the product is correct.
b. Jones reagent `(H_(2)CrO_(4)+ "aqueous acetone")` oxidies `1^(@)` and `2^(@)` alcohols to aldehydes and ketones, respectively, but does not oxidise `(C=C)` bond, so the product is correct.
`MnO_(2)` oxidies only allylic or benzylic hydroxyl group, so no reaction takes place.
c. `SeO_(2)//MeCOOH` selectively hydroxylate allylic position, and simultaneously converts active methylene group to `(-CHO)` group, so the product is correct.
d. The ring `(B)` containing `EWG` (e.g., `(-NO_(2))` group) is stable and therefore does not undergo oxidation, while ring `(A)` is oxidised.
The ring `(B)` containing `EDG` (e.g.,`(-NH_(2))` group) is unstable and undergoes oxidation. So both the products are correct.
So the answers are `(a), (b), (c )`, and `(d)`.