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STD 12 - 6. Haloalkanes and Haloarenes — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 6. Haloalkanes and Haloarenes4 Marks
MCQ
Assertion : Cyanide $(CN^-)$ is a strong nucleophile.
Reason : Benzonitrile is prepared by the reaction of chlorobenzene with potassium cyanide.
  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • ✓
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: C.
If the Assertion is correct but Reason is incorrect.
c
Aryl halides (chlorobenzene) do not undergo nucleophilic substitution with $KCN$ because of the low reactivity of the $Cl$ atom, which is because of resonance in chlorobenzene. So assertion is true. Reason is false.

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