JEE PYQ: Aldehydes And Ketones Question 12
Question 12 - 2021 (26 Feb Shift 2)
Branched ketone $\xrightarrow{\text{Zn/HCl}}$ $\xrightarrow{\text{Cr}_2\text{O}_3, \text{773K, 10-20 atm}}$ product?
(1). (Ethyl phenyl ketone)
(2). (Propylbenzene)
(3). (Ethylbenzene)
(4). (Xylene)
Show Answer
Answer: (3)
Solution
Clemmensen reduction (Zn/HCl) reduces C=O to CH$_2$. Then aromatization with Cr$_2$O$_3$ at 773K gives ethylbenzene.