JEE PYQ: Aldehydes And Ketones Question 38
Question 38 - 2019 (10 Jan Shift 2)
Conjugated polyene aldehyde with CH$_3$N group $\xrightarrow{\text{NaBH}_4}$ ?
(1). (Allylic alcohol (double bonds intact, OH))
(2). (Reduced double bond + OH)
(3). (C=O intact, C=N reduced)
(4). (Allylic alcohol with all double bonds intact)
Show Answer
Answer: (4)
Solution
NaBH$_4$ reduces only the aldehyde CHO to CH$_2$OH. C=C bonds and C-N bonds remain intact.
BETA
