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Question

The given reaction is a :
243408_6978196eae0d42c08d6a11a54a170bcf.png


A
1,4 addition reaction
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B
2,3 addition reaction
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C
Neutralisation reaction
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D
none
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Solution

The correct option is A 1,4 addition reaction
The given reaction is a 1,4 addition reaction.
In the first step, a molecule of $$HBr$$ is added to a conjugated diene. Both $$H$$ atom and $$Br$$ atom are added to terminal $$C$$ atoms. This is 1,4 addition or conjugate addition. In the next step, the reaction with $$Mg$$ in presence of ether gives a Grignard reagent ($$R-MgX$$) which then attacks a molecule of carbon dioxide. Acid hydrolysis gives carboxylic acid.
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Chemistry

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