JEE PYQ: Aldehydes And Ketones Question 43
Question 43 - 2019 (11 Jan Shift 2)
Chromene lactone + Br$_2$ (1 eq.)/MeOH:
(1). (Br on $\alpha$-carbon with OMe)
(2). (Br on ring with MeOH addition)
(3). (Br on methyl group)
(4). (Br on ring, methyl intact)
Show Answer
Answer: (2) (Note: Answer key shows 1)
Solution
1 eq Br$_2$ in MeOH adds across the enol ether double bond giving bromo-methoxy product.