Question

When phenol is treated with conc. H2SO4 at 373 K, the major products
a) o-Hydroxy benzene sulphonic acid
b) p-Hydroxy benzene sulphonic acid
c)A mixture of o- and p-hydroxy benzene sulphonic acid
D)m-Hydroxy benzene sulphonic acid

Answer 1

Answer:

b) p-Hydroxy benzene sulphonic acid

Explanation:

Answer 2

When phenol is treated with $Conc. [H_{2}SO_{4}]$ at 373 K, the major product is (b) p-Hydroxy benzene sulphonic acid.

This Reaction is termed as Sulphonation of phenol:

1. When Phenol is treated with $Conc. [H_{2}SO_{4}]$ at room temperature [i.e. 270K - 290K], the product formed is Ortho -  Hydroxy Benzene Sulphonic Acid. The production of this compound is caused under thermodynamic control. Additionally, due to the formation of intramolecular hydrogen bonding, it is relatively stable.
2. When Phenol is treated with $Conc. [H_{2}SO_{4}]$ at Higher temperature [i.e. 373K], the product formed is Para -  Hydroxy Benzene Sulphonic Acid. The production of this compound is caused under kinetic or rate control. Additionally, due to the absence of intramolecular hydrogen bonding, it is relatively unstable.

Depending on the temperature, Sulphonation of phenol occurs easily to produce either the ortho isomer or the para isomer. Ortho isomer formed at low temperatures, while para isomer formed at high temperatures (370 K).

Since we are given a Higher Temperture i.e. 373K; THEREFORE:

The main product of phenol's reaction with concentrated H2SO4 at 373 K is p-Hydroxy Benzene Sulphonic Acid.

Learn more about Phenol:

https://brainly.in/question/6335442?msp_srt_exp=4

Find more about sulphonation by $[H_{2}SO_{4}]$:

https://brainly.in/question/3103504?msp_srt_exp=4

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