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  4. Arrange the following alkyl halides in order of dehydrohalogenation; C2H5I,C2H5Cl,C2H5Br,C2H5F

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Q. Arrange the following alkyl halides in order of dehydrohalogenation; $C_{2}H_{5}I,C_{2}H_{5}Cl,C_{2}H_{5}Br,C_{2}H_{5}F$

NTA AbhyasNTA Abhyas 2020Haloalkanes and Haloarenes

Solution:

As with the increase in size $X^{-}$ bond length increases but bond strength decreases so reactivity increases. As size increases as $F^{-} < Cl^{-} < Br^{-} < I^{-}$ .

Hence reactivity order is $C_{2}H_{5}I>C_{2}H_{5}Br>C_{2}H_{5}Cl>C_{2}H_{5}F$