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  • Give reasons for the following : (a) The presence of  group at ortho or para position increases the reactivity of haloarenes towards nucleop

Give reasons for the following :

(a) The presence of -NO_{2} group at ortho or para position increases the reactivity of haloarenes towards nucleophilic substitution
reactions.

(b) p-dicholorobenzene has higher melting point than that of ortho or meta isomer.

(c) Thionyl chloride method is preferred for preparing alkyl chloride from alcohols.

 

 

 

 
 
 
 
 

Answers (1)

(1) Presence of nitro group at O- and p- positions increasesreactivity  of haloarness towards nucleophilic substitution reactions as they stabilize the intermidiate carbanion due to disposal of negative charge.

(2) p-dichlorobenzene has higher melting point than that of O- or m- isomer because it fits better in crystal lattice as compared to O- and m-. Hence due to symmetry.

(3) Thionyl chloride method is prefferred for preparing alkyl chloride from alcohols because by product formed are gases.

    CH_{3}OH+SOCl_{2}\rightarrow CH_{3}Cl+SO_{2}\uparrow+HCl\uparrow

Posted by

Sumit Saini

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