Question

What is the product of CH2= CH-NO2 + HBr what product form ?

Answer 1

When 1-nitroethene (  CH$_{2}$=CH-NO$_{2}$ ) is reacted with hydrogen bromide ( HBr ) , the product formed is BrCH$_{2}$-CH$_{2}$-NO$_{2}$ .

   CH$_{2}$=CH-NO$_{2}$ + HBr  →  BrCH$_{2}$-CH$_{2}$-NO$_{2}$

• This reaction does not follow Markovnikov addition .
• Due to the presence of the nitro group , the positive charge is developed on the second carbon . So , the Bromide anion goes for the second carbon and the hydrogen cation goes for the first carbon attached to the nitro group .