Ethene reacts with hydrogen bromide to give

Chemistry JAMB 2003

Ethene reacts with hydrogen bromide to give

  • CH2Br2
  • CH3CH2Br checkmark
  • C2H2Br2
  • CHBr2

The correct answer is: B

Explanation

When ethene, C\(_2\)H\(_4\) reacts with hydrogen bromide (HBr), the product is bromoethane (C\(_2\)H\(_5\)Br): 

              C\(_2\)H\(_4\)   +   HBr  →  C\(_2\)H\(_5\)Br

This reaction is an addition reaction where HBr adds across the double bond of ethene: 

  1. The double bond breaks
  2. A hydrogen atom attaches to one of the carbons
  3. A bromine atom attaches to the other
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