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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.
Which of the following molecules has a chiral centre correctly labelled with an asterisk (*) ?
Why do tertiary alkyl halides undergo SN1 reaction at a faster rate ?
Define Enantiomers.
Why is chloroform stored in dark coloured air tight bottles ?
Answer any three of the following :
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