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Question

Chemistry Question on Organic Chemistry- Some Basic Principles and Techniques

Correct the increasing order of acidity is as

A

H2O,C2H2,H2CO3H_2O,C_2H_2,H_2CO_3, phenol

B

C2H2,H2O,H2CO3,C_2H_2, H_2O, H_2CO_3, phenol

C

Phenol, C2H2,H2CO3,H2OC_2H_2,H_2CO_3,H_2O

D

C2H2,H2O,phenolandH2CO3_2H_2,H_2O, phenol \, and \, H_2CO_3

Answer

C2H2,H2O,phenolandH2CO3_2H_2,H_2O, phenol \, and \, H_2CO_3

Explanation

Solution

C2H2_2H_2 have acidic nature but it is less acidic than
water but phenol is more acidic than water due to
resonance stabilisation of phenoxide ion. H2CO3_2CO_3 is
most acidic due to resonating stabilisation of
carbonate ion (CO32_3^{2-}).
Thus, the correct order is
C2H2<H20<phenol<H2CO3\, \, \, \, \, \, C_2H_2 < H_20 < phenol < H_2CO_3