3In the presence of an electron withdrawing gp at the ortho and para position Nucleophilic substitution will occurs.If u have Arihant or NCERT +1 u can verify it and u can get more information from these buks
has to be matched with
(p) Nucleophilic substitution
(q) Elimination
(r) Nucleophilic addition
(s) Esterification with acetic anhydride
(t) Dehydrogenation
i get p,q,r and many solution of jee09 have given only p why not we will take benzyne mechanism
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10 Answers
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1as benzyne mechanism proceeds via elimination and then nucleophilic addition so why we dont match it
3Actually sory rahul i dunno benzyne mechanism becos it is not included in the jee syllabus.
Actually in benzyne mechanism the rxn is not a complete elimination or a complete Nucleophilic addition .the rxn can be seen as a Nucleophile is substituted .
http://upload.wikimedia.org/wikipedia/commons/c/c8/Substitution_via_benzyne.svg
11Characteristic reactions of the following (including those mentioned above): Alkyl halides: rearrangement reactions of alkyl carbocation, Grignard reactions, nucleophilic substitution reactions; Alcohols: esterification, dehydration and oxidation, reaction with sodium, phosphorus halides, ZnCl2/concentrated HCl, conversion of alcohols into aldehydes and ketones; Ethers:Preparation by Williamson’s Synthesis; Aldehydes and Ketones: oxidation, reduction, oxime and hydrazone formation; aldol condensation, Perkin reaction; Cannizzaro reaction; haloform reaction and nucleophilic addition reactions (Grignard addition); Carboxylic acids: formation of esters, acid chlorides and amides, ester hydrolysis; Amines: basicity of substituted anilines and aliphatic amines, preparation from nitro compounds, reaction with nitrous acid, azo coupling reaction of diazonium salts of aromatic amines, Sandmeyer and related reactions of diazonium salts; carbylamine reaction; Haloarenes: nucleophilic aromatic substitution in haloarenes and substituted haloarenes (excluding Benzyne mechanism and Cine substitution).
11I dont mean to say it is wrong but this may be why many insts left out q and r
1but if their is possible way of reacting then we have to elimination and addition as they are in b/w the reaction why not so
1357I think its because q and r separately don't give any products, as benzyne is elimination-addition reaction