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TS EAMCET · Chemistry · Redox Reactions

Which of the following is only a redox reaction but not a disproportionation reaction?

  1. A \(4 \mathrm{H}_3 \mathrm{PO}_3 \rightarrow 3 \mathrm{H}_3 \mathrm{PO}_4+\mathrm{PH}_3\)
  2. B \(2 \mathrm{H}_2 \mathrm{O}_2 \rightarrow 2 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2\)
  3. C \(\mathrm{P}_4+3 \mathrm{NaOH}+3 \mathrm{H}_2 \mathrm{O} \rightarrow 3 \mathrm{NaH}_2 \mathrm{PO}_2+\mathrm{PH}_3\)
  4. D \(\mathrm{P}_4+8 \mathrm{SOCl}_2 \rightarrow 4 \mathrm{PCl}_3+2 \mathrm{~S}_2 \mathrm{Cl}_2+4 \mathrm{SO}_2\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(\mathrm{P}_4+8 \mathrm{SOCl}_2 \rightarrow 4 \mathrm{PCl}_3+2 \mathrm{~S}_2 \mathrm{Cl}_2+4 \mathrm{SO}_2\)

Step-by-step Solution

Detailed explanation

The reaction \(\mathrm{P}_4+8 \mathrm{SOCl}_2 \rightarrow 4 \mathrm{PCl}_3+2 \mathrm{~S}_2 \mathrm{Cl}_2+4 \mathrm{SO}_2\) involves change of oxidation state of \(\mathrm{P}\) from 0 to +3 and that of \(S\) from +4 to +2 . Thus, it is a redox reaction but not a…