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Give the order of reactivity towards E2 ...

Give the order of reactivity towards `E2` dehydrohalo-genation of the following.
a. i. `C_(2)H_(5)Br`
ii. `C_(3)H_(7)Br`
iii. Isobutyl bormide
iv. Neopentyl bromide
b. i. `2-` Bromo `-2-` methybutane
ii. `1-` Bromo pentane
iii. `2-` Bromo pentane
iv. `3-` Bromo pentane

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`(iii) gt (ii) gt (i)`. Neopenthyl bromide does not undergo dehydrohalogenation as `C-` bearing bromide does not contain hydrogen. Reactivity in `E2` dehydrohalo-genation depends mainly on the stabilty of the alkens being formed which is govered by Saytzeff's rule.
b. `(i) gt (iv) gt (iii) gt (ii)`. The stability of alkenes being formed decides the rate of dehyrohalogenation.
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