Which of the following statements is wrong?

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(B) $1$. Ethyl chloride $(C_2H_5Cl)$ on reduction with $Zn-Cu$ couple and alcohol gives ethane $(C_2H_6)$. This is correct.$2$. The reaction of methyl

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

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(B) $1$. Ethyl chloride $(C_2H_5Cl)$ on reduction with $Zn-Cu$ couple and alcohol gives ethane $(C_2H_6)$. This is correct.$2$. The reaction of methyl magnesium bromide $(CH_3MgBr)$ with acetone $(CH_3COCH_3)$ gives tert-butanol ($2$-methylpropan-$2$-ol),not butanol-$2$. Thus,statement $B$ is wrong.$3$. Alkyl halides follow the reactivity sequence $R-I > R-Br > R-Cl > R-F$ due to the decreasing bond dissociation energy of the $C-X$ bond. This is correct.$4$. $C_2H_4Cl_2$ exists as two isomers: $1,1$-dichloroethane and $1,2$-dichloroethane. This is correct.

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