Phenol on sulphonation at $100^{o} C$ gives:

o-phenol sulphonic acid

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p-phenol sulphonic acid

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m-phenol sulphonic acid

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o- and p-phenol sulphonic acid

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Solution

The correct option is D p-phenol sulphonic acid
Phenol on sulphonation gives either o-phenol sulphonic acid or p-phenol sulphonic acid. It depends on temperature.
At room temperature (298 K), o-phenol sulphonic acid is obtained.
At 373 K, p-phenol sulphonic acid is obtained.

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