Verified Solution • 2025–26 Session
moderate
QJEEM19Ch4525: JEE Main 2019 Chemistry - Class 12 JEEM19Ch4525 Solution: Which of the following compounds reacts with ethylmagnesium…
Which of the following compounds reacts with ethylmagnesium bromide and also decolourizes bromine water solution:
Multiple Choice Options
- A https://ik.imagekit.io/novatra/photos/61b07e000c05fb0fda4a31c0fe42fec78660fc601f58ade34cb13fa15c6c223b.webp
- B https://ik.imagekit.io/novatra/photos/f9a01a8fb7e26661f4baaf9dc6ce91a17e5f9639f26fd454aedf3b85b2dbec45.webp
- C https://ik.imagekit.io/novatra/photos/e3e34f7b5b43d7fbb6e3edda5ad47ea151faf4f9b3737e02a605029c349780d0.webp
- D https://ik.imagekit.io/novatra/photos/0a6c0dfc7ef4d5c716986edee170b16762f9788095c83256461b0da2c0768648.webp
Step-by-Step Verified Solution
For option (B) :
C2H5MgBr performs addition reaction with - C N.
C2H5MgBr performs substitution reaction with ester -COOCH3.
Conjugated dienes (two double bonds separated by a single bond) gives Br water test. Either 1-2 or 1-4 addition can happen.
For option (C) :
C2H5MgBr reacts with -OH group and creates alkane C2H6.
As here C = C present, so this compound gives Br water tests.
C2H5MgBr performs addition reaction with - C N.
C2H5MgBr performs substitution reaction with ester -COOCH3.
Conjugated dienes (two double bonds separated by a single bond) gives Br water test. Either 1-2 or 1-4 addition can happen.
For option (C) :
C2H5MgBr reacts with -OH group and creates alkane C2H6.
As here C = C present, so this compound gives Br water tests.