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The polarity of C – X bond of alkyl halides is responsible for their nucleophilic substitution, elimination and their reaction with metal atoms to form organometallic compounds. Alkyl halides are prepared by the free radical halogenation of alkanes, addition of halogen acids to alkenes, replacement of – OH group of alcohols with halogens using phosphorus halides, thionyl chloride or halogen acids. Aryl halides are prepared by electrophilic substitution of arenes. Nucleophilic substitution reactions are categorised into SN1 and SN2 on the basis of their kinetic properties. Chirality has a profound role in understanding the SN1 and SN2 mechanism.
Write the major alkene that would be formed by dehydrohalogenation of 2-Bromopentane.
Which would undergo SN2 reaction at a faster rate and why ? CH₃–CH₂–Br and CH₃–C(CH₃)₂–Br
1,2-Dichloroethane is heated with KOH (1 mole) in ethanol. The major product formed is :
Answer any three of the following :
Why haloarenes are not reactive towards nucleophilic substitution reaction ? Give two reasons.
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