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Which of the following could be employed...

Which of the following could be employed to transform ethanol into 1-propanol?

A

HBr,Mg/ether then`H_3O^+`

B

HBr,Mg/ether the HCHO them `H_3O^+`

C

`H_2SO_4"at" 140^@C`

D

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The correct Answer is:
B
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