The order of reactivity of the followin alcohols towards conc. HCl is

1.	The order of reactivity of the followin alcohols towards conc. HCl is
Answer» `I gt II gt III gt IV` `I gt III gt II gt IV` `IV gt III gt II gt I` `IV gt III gt I gt II` Solution :When alcohols REACT with HX it is the `R-OH` bond which breaks. The more stable the carbocation formed, more is the REACTIVITY of the alcohols. The carbocations formed in case of these alcohols (I, II, III and IV) are `F -CH_(2)-underset((I))(overset(+)(CH))- CH_(3)` `underset((II)) (F-CH_(2)-CH_(2)-overset(+)(CH)-CH_(3))` `underset((III))(CH_(3)-overset(+)(CH)-CH_(3))` `underset((IV))(C_(6)H_(5)-overset(+)(CH_(2))` The relative stabilities of carbocations and hence the order of reactivity of corresponding alcohols is `IV gt III gt II gt I`. The greater stability of carbocation (IV) is due to resonance. Carbocation II is a `2^(@)` carbocation and as such is quite stable. The lesser stability of carbocation I and II is due to the `-I` effect of F. ELECTRON with-drawing effect of F is more in case of carbocation I as in this case F is nearer to the carbon CARRYING +ve charge.

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