The correct increasing order of acidity is:

$H_{2} O, C_{2} H_{2}, H_{2} C O_{3}, p h e n o l$

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$C_{2} H_{2}, H_{2} O, H_{2} C O_{3}, p h e n o l$

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$P h e n o l, C_{2} H_{2}, H_{2} C O_{3}, H_{2} O$

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$C_{2} H_{2}, H_{2} O, p h e n o l, H_{2} C O_{3}$

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Solution

The correct option is D
$C_{2} H_{2}, H_{2} O, p h e n o l, H_{2} C O_{3}$

$C_{2} H_{2}$ have acidic nature but it is less acidic than water. Phenol is more acidic than water due to resonance stabilisation of phenoxide ion. $H_{2} C O_{3}$ is most acidic due to reasonating stabilisation of carbonate ion $(C O_{3}^{2 -})$ .

Thus, the correct order is $C_{2} H_{2} < H_{2} O < p h e n o l < H_{2} C O_{3}$

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Similar questions

The correct increasing order of acidity is:

C O_{2}, H_{2} O

H_{2} O_{2}

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