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Chemistry · PYQ NEET UG 2025

हिन्दी

Which one of the following reactions does NOT give benzene as the product ?

  1. \( \mathrm{C}_6\mathrm{H}_5\mathrm{COONa} + \mathrm{NaOH} \xrightarrow{\mathrm{CaO}, \Delta} \)
  2. n-hexane \( \xrightarrow{\mathrm{Mo}_2\mathrm{O}_3, 773\mathrm{K}, 10-20\text{ atm}} \)
  3. \( \mathrm{H}-\mathrm{C}\equiv\mathrm{C}-\mathrm{H} \xrightarrow{\text{red hot Iron Tube, } 873\mathrm{K}} \)
  4. \( \mathrm{C}_6\mathrm{H}_5\mathrm{N}_2^+\mathrm{Cl}^- \xrightarrow{\mathrm{H}_2\mathrm{O}, \text{warm}} \)

Correct answer · Option 4

\( \mathrm{C}_6\mathrm{H}_5\mathrm{N}_2^+\mathrm{Cl}^- \xrightarrow{\mathrm{H}_2\mathrm{O}, \text{warm}} \)

Explanation

Reaction (4) of benzene diazonium chloride with warm water yields phenol \( (\mathrm{C}_6\mathrm{H}_5\mathrm{OH}) \), not benzene.
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