SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Halogenoalkanes can undergo SN1 and SN2 reactions with aqueous sodium hydroxide. Which halogenoalkane will react fastest with a 0.1 moldm-3 solution of aqueous sodium hydroxide?
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2-chloro-2-methylpropane
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2-iodo-2-methylpropane
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1-chlorobutane
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1-iodobutane
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Explanation:
Detailed explanation-1: -Tertiary halogenoalkanes will undergo a SN1 reaction.
Detailed explanation-2: -However, the fastest reaction is with an iodoalkane. In these reactions, bond strength is the main factor deciding the relative rates of reaction.
Detailed explanation-3: -The SN2 reaction in secondary halogenoalkanes Again, a lone pair on the approaching hydroxide ion forms a bond with the + carbon and, in the process, the electrons in the carbon-bromine bond are forced entirely onto the bromine to create a bromide ion.
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