Mark the correct increasing order of reactivity of the
following compounds with HBr/HCl.
(a) I < II < III (b) II < I < III
(c) II < III < I (d) III < II < I
Answers
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Answer:
A option is the correct sequence
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II < III < I is the correct order of reactivity.
Explanation:
- The reaction of an alcohol with HCl or HBr is a nucleophilic substitution.
- The nucleophile Br- attacks the alcohol and removes the hydroxyl group while itself taking the place.
- We know that nucleophilic substitution takes place through carboncation formation.
- Among the reactants given, they are benzyl alcohol, paranitrobenzyl alcohol and parachlorobenzyl alcohol.
- Since both nitro and chloro group are electron withdrawing groups, then they decrease the chances of carboncation formation of the benzyl alcohol.
- But nitro group being stronger, decrease less than that of chlorine.
- So the reactivity order is II < III < I.
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