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JEE Advanced2026ChemistryHydrocarbonsActual

In the following reaction sequence, Q , R , S and T are the major products. The correct statement(s) about Q , R , S and T is(are)

Options

  1. AS on warming with ammoniacal AgNO ₃ results in the formation of silver mirror.
  2. BQ on treatment with Cl ₂ (excess)/UV gives gammaxane.
  3. CT is a heterocyclic compound.
  4. DR on acid catalyzed intramolecular cyclization followed by treatment with Zn-Hg/HCl gives 9,10-dihydroxyanthra

Correct answer

A. S on warming with ammoniacal AgNO ₃ results in the formation of silver mirror.

Step-by-step solution

Kolbe's electrolysis of sodium butyrate ( CH ₃ CH ₂ CH ₂ COONa ) yields n-hexane. Aromatization of n-hexane using V ₂ O ₅ at 500^ C produces benzene ( Q ). Benzene ( Q ) reacts with phthalic anhydride in the presence of anhydrous AlCl ₃ to form o-benzoylbenzoic acid ( R ). Treatment of R with PCl ₅ gives o-benzoylbenzoyl chloride, which upon Rosenmund reduction ( H ₂- Pd/BaSO ₄ ) yields o-benzoylbenzaldehyde ( S ). Condensation of S with hydrazine ( NH ₂ NH ₂ ) forms 1-phenylphthalazine ( T ). Evaluating the option

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