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When 1,3-butadiene (CH2=CH–CH=CH2) is treated with HBr, two constitutional isomers are formed, CH3CHBrCH=CH2 and BrCH2CH=CHCH3. Explain...

When 1,3-butadiene (CH2=CH–CH=CH2) is treated with HBr, two constitutional isomers are formed, CH3CHBrCH=CH2 and BrCH2CH=CHCH3.

Explain and draw a stepwise mechanism that accounts for the formation of both products.

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