Question

The correct order of increasing acidic strength is ........ .
(a) phenol < ethanol < chloroacetic acid < acetic acid
(b) ethanol < phenol < chloroacetic acid < acetic acid
(c) ethanol < phenol < acetic acid < chloroacetic acid
(d) chloroacetic acid < acetic acid < phenol < ethanol

Answer 1

(c )ethanol < phenol < acetic acid < chloroacetic acid

Answer 2

Answer:

The correct order of increasing acidic strength is:

(c) ethanol < phenol < acetic acid < chloroacetic acid

Explanation:

From the above question,

They have given :

1. Ethanol (CH3CH2OH) is the weak acid, because it can donate a proton to form its conjugate base CH3CH2O-.
2. Phenol (C6H5OH) is a stronger acid than ethanol because the aromatic ring of phenol stabilizes its conjugate base C6H5O-.
3. Acetic acid (CH3COOH) is a stronger acid than phenol. This is because of the carbonyl group in the acetic acid molecule which can withdraw electron density from the O-H bond, making it more acidic.
4. Chloroacetic acid (ClCH2COOH) is the strongest acid in the list because of the electronegative chlorine atom. This  can further withdraw electron density from the O-H bond, This is making it more acidic than acetic acid.

Therefore, the correct order of increasing acidic strength is,

ethanol < phenol < acetic acid < chloroacetic acid.

Ethanol < Phenol < Acetic acid < Chloroacetic acid are the correct order of increasing acidic strength.

Because the phenoxide ion formed during deprotonation is stabilised by resonance in phenol, it is more acidic than ethanol.

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