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NEET Chemistry QUESTION #1110
Question 1
Statement I: Benzenediazonium salt is prepared from aniline + nitrous acid at 273–278 K and decomposes easily in dry state. Statement II: Iodobenzene is prepared through reaction of benzenediazonium salt with KI because direct iodination of benzene ring is difficult.
  • Statement I is correct but Statement II is incorrect
  • Statement I is incorrect but Statement II is correct
  • Both Statement I and Statement II are correct(Correct)
  • Both Statement I and Statement II are incorrect
Correct Answer Explanation
Statement I is correct — diazotization of aniline occurs at 0–5°C (273–278 K) with NaNO\(_2\)/HCl; the salt is unstable and decomposes in dry state. Statement II is correct — direct iodination of benzene is very slow/difficult; the Sandmeyer-type reaction with KI is used to introduce iodine via diazonium salt.