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Karnataka Board PUCPUC Science 2nd PUC Class 12

Reaction of CX6HX5CHX2Br with aqueous sodium hydroxide follows ______.

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Question

Reaction of \[\ce{C6H5CH2Br}\] with aqueous sodium hydroxide follows ______.

Options

  • SN1 mechanism

  • SN2 mechanism

  • Any of the above two depending upon the temperature of reaction

  • Saytzeff rule

MCQ
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Solution

Reaction of \[\ce{C6H5CH2Br}\] with aqueous sodium hydroxide follows SN1 mechanism.

Explanation:

Greater the stability of carbonation, greater will be its ease of formation from alkyl halide and faster will be the rate of reaction. In case of alkyl halides, 3° carbocations.

For the same reasons, allylic and benzylic halides show high reactivity towards the SN1 reaction. The carbonation thus formed gets stabilized through resonance as shown below:

So, as the given compound, \[\ce{C6HCH2Cl}\] is a benzylic halide, it would undergo SN1 reaction.

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Chapter 10: Haloalkanes and Haloarenes - Exercises [Page 138]

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NCERT Exemplar Chemistry Exemplar [English] Class 12
Chapter 10 Haloalkanes and Haloarenes
Exercises | Q I. 23. | Page 138

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