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JEE Main levelSingle correct optionDifficulty 2 of 3o3181

Assertion (A): 1-Fluoro-4-nitrobenzene reacts with sodium methoxide faster than 1-iodo-4-nitrobenzene. Reason (R): The C-F bond is weaker than the C-I bond.

  1. ABoth A and R are true and R is the correct explanation of A
  2. BBoth A and R are true but R is not the correct explanation of A
  3. CA is true but R is false
  4. DA is false but R is true

Answer: C

A is true: the SNAr rate order is > because the rate-determining addition step is favoured by the electronegativity of fluorine. R is false, since C-F is the strongest carbon-halogen bond. So A is true and R is false.
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