Question

In the following reaction ‘A ’ is
C₂H₅MgBr + H₂C – CH₂ □(→┴H₂O )
O
(a) C₂H₅CH₂CHO (b) C₂H₅CH₂CH₂OH
(c) C₂H₅CH₂OH (d) C₂H₅CHO

Answer 1

In the following reaction ‘A ’ is

C₂H₅MgBr + H₂C – CH₂ □(→┴H₂O )

O

(a) C₂H₅CH₂CHO

(b) C₂H₅CH₂CH₂OH

(c) C₂H₅CH₂OH (d) C₂H₅CHO

Answer 2

C₂H₅CH₂CH₂OH is the product.

Explanation:

• Grignard reagents are strong nucleophiles with negative charge on alkyl groups.

• These grignards react on epoxide quite well.

• The grignard attacks the less substituted carbon oxygen bond.

• This adds the alkyl group of the grignard with carbon.

• The hydrolysis forms the basic magnesium bromide and primary alcohol.

• This mechanism goes through the carbanion mechanism.

• So the primary alcohol is mostly formed.

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