Which of the following statements is wrong?  

Ethyl chloride on reduction with Zn-Cu couple and  alcohol gives ethane. 

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

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

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