The increasing order of reduction of alkyl halides with zinc and dilute HCl is

1. $\mathrm{R}-\mathrm{Cl}<\mathrm{R}-\mathrm{I}<\mathrm{R}-\mathrm{Br}$

2. $\mathrm{R}-\mathrm{Cl}<\mathrm{R}-\mathrm{Br}<\mathrm{R}-\mathrm{I}$

3. $\mathrm{R}-\mathrm{I}<\mathrm{R}-\mathrm{Br}<\mathrm{R}-\mathrm{Cl}$

4. $\mathrm{R}-\mathrm{Br}<\mathrm{R}-\mathrm{I}<\mathrm{R}-\mathrm{Cl}$

Arrange the following alkyl halides in decreasing order of the rate of $\mathrm{\beta }$-elimination reaction with alcoholic KOH.

A.
B.	CH3-CH2-Br
C.	CH3-CH2-CH2-Br

1. A>B>C

2. C>B>A

3. B>C>A

4. A>C>B