JEE Main 2019 — Alcohols Phenols And Ethers Question with Solution
From: JEE Main 2019 (Online) 11th January Evening Slot
Question
Which of the following compounds reacts with ethylmagnesium bromide and also decolourizes bromine water solution:
Choose an option
Show full solutionCorrect option: B
Correct answer
B
Step-by-step explanation
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.
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This is a previous-year question from JEE Main 2019, covering the Alcohols Phenols And Ethers chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.