JEE PYQ: Aldehydes And Ketones Question 42
Question 42 - 2019 (11 Jan Shift 2)
Which compound reacts with EtMgBr and decolourizes bromine water?
(1). (CN-substituted acetophenone)
(2). (Cyanoacetate)
(3). ($o$-methoxystyrene)
(4). (Vinyl phenol (OH + CH=CH$_2$))
Show Answer
Answer: (4)
Solution
Phenol OH reacts with Grignard (acid-base). Vinyl C=C decolourizes Br$_2$ water.