Which of the following statements is wrong?

• A

  Ethyl chloride on reduction with $\mathrm{Zn}-\mathrm{Cu}$ couple and alcohol gives ethane.
• Correct answer
  B

  The reaction of methyl magnesium bromide with acetone gives butanol-2.
• C

  Alkyl halides follow the following reactivity sequence on reaction with alkenes. $$ \mathrm{R}-\mathrm{I}>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{I} $$
• D

  $\mathrm{C}_2 \mathrm{H}_4 \mathrm{Cl}_2$ may exist in two isomeric forms

Hence, the correct answer is option: 'B'.