Q63 of 97 Page 142

Why can aryl halides not be prepared by reaction of phenol with HCl in the presence of ZnCl2?

Phenol contains the phenyl ring bonded to the hydroxyl group. Due to the resonance stabilization of the ring, the hydroxyl group attached to it gains a partial double bond, which makes it difficult for the cleavage of this bond in order to be subject to chlorination.


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61

Name the alkene which will yield 1-chloro-1-methylcyclohexane by its reaction with HCl. Write the reactions involved.

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Which of the following haloalkanes reacts with aqueous KOH most easily? Explain giving reason.

(i) 1-Bromobutane


(ii) 2-Bromobutane


(iii) 2-Bromo-2-methylpropane


(iv) 2-Chlorobutane


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Which of the following compounds would undergo SN1 reaction faster and why?

(A)



(B)



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Allyl chloride is hydrolysed more readily than n-propyl chloride. Why?