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Question

Which of the statements is/are correct?
  1. In Reformatsky reaction, αbromo ester reacts with aldehyde or ketone in the presence of Mg to give β-hydroxy ester
  2. In Reformatsky reaction, α bromo ester reacts with aldehyde or ketone in the presence of Zn to give β hydroxy ester
  3. Citric acid is prepared by the reaction of α-bromoethyl oxaloacetate in the presence of Zn followed by hydrolysis
  4. Citric acid is prepared by the fermentation of molasses in the presence of Aspergillus wenti enzymes

A
In Reformatsky reaction, αbromo ester reacts with aldehyde or ketone in the presence of Mg to give β-hydroxy ester
B
Citric acid is prepared by the fermentation of molasses in the presence of Aspergillus wenti enzymes
C
In Reformatsky reaction, α bromo ester reacts with aldehyde or ketone in the presence of Zn to give β hydroxy ester
D
Citric acid is prepared by the reaction of α-bromoethyl oxaloacetate in the presence of Zn followed by hydrolysis
Solution
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The statement A is incorrect and the statements B, C and D are correct.

In Reformatsky reaction, α−bromo ester reacts with aldehyde or ketone in the presence of Zn (and not Mg) to give β−hydroxy ester.

BrCH2COOCH3+CH3CHOZnCH3(HO)CH2COOCH3

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