SATHEE: Aryl Halides and Phenols

Aryl Halides and Phenols - Result Question 4

####5. Which of the following compounds reacts with ethyl magnesium bromide and also decolourises bromine water solution

(2019 Main, 11 Jan II) (a)

(c)

(b)

(d)

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Answer:

Correct Answer: 5. $(b, d)$

Solution:

Ethyl magnesium bromide is a Grignard reagent (GR), it constitutes $C_{2} H_{5}^{-} [C_{2} H_{5}^{-} \overset{\oplus}{M} g B r$ in ether/aprotic medium $]$ which can act as nucleophile as well as strong base. Bromine water $(B r_{2} / H_{2} O$ , red $)$ gets decolourised with phenol derivatives (option, c), anisole derivatives (option, b) etc., as $> C = C <$ is present outside the ring (aliphatic, not aromatic).

(a)

(b)

(d)

Et group can react but $(B r_{2} / H_{2} O)$ does not react

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Aryl Halides and Phenols - Result Question 4

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