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Haloalkanes and Haloarenes question

2008 · Q88
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Haloalkanes and Haloarenes question

2008 · Q88

NEETChemistryHaloalkanes and HaloarenesMCQ+4 / −1
In a SN2 substitution reaction of the type
R −-− Br + Cl−-− →DMF\xrightarrow{DMF}DMF​ R−-−Cl + Br−-−
which one of the following has the highest relative rate?
  1. A
    AIPMT 2008 Chemistry - Haloalkanes and Haloarenes Question 19 English Option 1
  2. B
    CH3CH2Br
  3. C
    CH3CH2CH2Br
  4. D
    AIPMT 2008 Chemistry - Haloalkanes and Haloarenes Question 19 English Option 4
View written solutionFree

Correct answer: B

SN2 mechanism is followed in case of primary and secondary halides i.e., SN2 reaction is favoured by small groups on the carbon atom attached to halogens so

CH3 – X > R – CH2 – X > R2CH – X > R3C – X

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