$p$-toluene sulphonic acid on fusion with solid
KOH at 573 K followed by treatment with dilute
HCl gives

• Correct answer
  A

  $p$-cresol
• B

  toluene
• C

  brenzoic acid
• D

  benzene 1, 4-diol

Solution

The complete reaction involved is as follows,

Hence, the correct answer is option: 'A'.