Question:
Choose the incorrect statement.
Choose the incorrect statement.
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When phenol reacts with concentrated H\(_2\)SO\(_4\), it undergoes electrophilic aromatic substitution to form phenyl sulphonic acid, not sulphaniilic aci(D)
Updated On: May 8, 2025
- Acidic nature of Phenol is due to -I effect of oxygen of the hydroxyl group.
- Acetylation of Salicylic acid produces 2-Acetoxybenzoic aci(D)
- m - Cresol is a weaker acid than Phenol.
- Phenol on heating with Con(C) H\(_2\)SO\(_4\) yields sulphaniilic aci(D)
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The Correct Option is D
Solution and Explanation
Let's analyze the given options:
(A) m-Cresol is a weaker acid than phenol. This statement is true. The presence of a methyl group in m-cresol at the meta position reduces the electron-donating effect, making m-cresol a weaker acid than phenol.
(B) Acidic nature of phenol is due to the -I effect of the oxygen in the hydroxyl group. This statement is also correct. The electron-withdrawing inductive effect (-I) of the oxygen in the hydroxyl group makes phenol more acidi(C).
(C) Acetylation of salicylic acid produces 2-acetoxybenzoic aci(D) This is true. Acetylation of the hydroxyl group in salicylic acid forms 2-acetoxybenzoic aci(D)
(D) Phenol on heating with Con(C) H\(_2\)SO\(_4\) yields sulphaniilic aci(D) This statement is incorrect. Phenol does not yield sulphaniilic acid upon heating with con(C) H\(_2\)SO\(_4\). Instead, it typically results in the formation of phenyl sulphonic acid (C\(_6\)H\(_5\)SO\(_3\)H). Thus, the incorrect statement is option (D).
(A) m-Cresol is a weaker acid than phenol. This statement is true. The presence of a methyl group in m-cresol at the meta position reduces the electron-donating effect, making m-cresol a weaker acid than phenol.
(B) Acidic nature of phenol is due to the -I effect of the oxygen in the hydroxyl group. This statement is also correct. The electron-withdrawing inductive effect (-I) of the oxygen in the hydroxyl group makes phenol more acidi(C).
(C) Acetylation of salicylic acid produces 2-acetoxybenzoic aci(D) This is true. Acetylation of the hydroxyl group in salicylic acid forms 2-acetoxybenzoic aci(D)
(D) Phenol on heating with Con(C) H\(_2\)SO\(_4\) yields sulphaniilic aci(D) This statement is incorrect. Phenol does not yield sulphaniilic acid upon heating with con(C) H\(_2\)SO\(_4\). Instead, it typically results in the formation of phenyl sulphonic acid (C\(_6\)H\(_5\)SO\(_3\)H). Thus, the incorrect statement is option (D).
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