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Question
R−OHPBr3−−−→AMg/Dry ether−−−−−−−−→BGrignard reaction−−−−−−−−−−−→CH2−CH2−OCH+/H2O−−−−−→D
What are A,B,C and D are respectively?
What are A,B,C and D are respectively?
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Solution
The correct option is D R−Br,R−Mg−Br,R−CH2−CH2−O−Mg−Br,R−CH2CH2−OH
R−OHPBr3→R−BrMg/Dry ether−−−−−−−−→R−Mg−BrGrignard reaction−−−−−−−−−−−→CH2−CH2−OR−CH2−CH2−O−Mg−Br H+/H2O−−−−−→RCH2−CH2−OH
PBr3 converts primary or secondary alcohol to alkyl halide. Mg and dryether forms Grignard reagent R-Mg-X , which on reaction with epoxide like ethylene oxide (CH2CH2O) forms R−CH2CH2−O−Mg−Br and then in presence of acid gives alcohol.
So the order is R−Br,R−Mg−Br, R−CH2−CH2−O−Mg−Br, R−CH2CH2−OH.
Hence option C is correct,
R−OHPBr3→R−BrMg/Dry ether−−−−−−−−→R−Mg−BrGrignard reaction−−−−−−−−−−−→CH2−CH2−OR−CH2−CH2−O−Mg−Br H+/H2O−−−−−→RCH2−CH2−OH
PBr3 converts primary or secondary alcohol to alkyl halide. Mg and dryether forms Grignard reagent R-Mg-X , which on reaction with epoxide like ethylene oxide (CH2CH2O) forms R−CH2CH2−O−Mg−Br and then in presence of acid gives alcohol.
So the order is R−Br,R−Mg−Br, R−CH2−CH2−O−Mg−Br, R−CH2CH2−OH.
Hence option C is correct,
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