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Q.

Among ethanol (I), Acetic acid (II), Phenol (III) and Benzoic acid (IV), the correct order of increasing acid strength is

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a

I < III < II < IV

b

I < III < IV < II

c

I < II < III < IV

d

III < IV < I < II 

answer is B.

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Detailed Solution

The acid strength order  of compounds : Carboxylic acids > Phenol > Alcohol .

Among carboxylic acids : Benzoic acid is more acidic than acetic acid due to -I effect of -C6H5 group. 

Hence the order: Benzoic acid > acetic acid > Phenol > Ehanol . 

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