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Question
The product B in above reaction is :
The product B in above reaction is :
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Solution
The correct option is C
NBS does allylic and benzylic bromination. Since 2 mole of NBS is taken so it will brominate both benzylic position generating 10 and 20 benzyl halide. In next step SN2 will happen preferentially at 10 position as only one mole of KCN is reacting.
Reaction will occur as follow :
NBS does allylic and benzylic bromination. Since 2 mole of NBS is taken so it will brominate both benzylic position generating 10 and 20 benzyl halide. In next step SN2 will happen preferentially at 10 position as only one mole of KCN is reacting.
Reaction will occur as follow :
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Product "A" in the above chemical reaction is 
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