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(i) Pentan-2-ol and Pentan-3-ol  (ii) Ethanol and Phenol

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Give chemical tests to distinguish between the following pairs of compounds : 

(i) Pentan-2-ol and Pentan-3-ol 

(ii) Ethanol and Phenol

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(i) Iodoform test : On adding I2 and NaOH, 

2-pentanol will give yellow precipitate of iodoform whereas 

3-pentanol will not give yellow precipitate.

Iodoform test

(ii) FeCl3 test : Phenol gives a violet colouration with FeCl3 solution while ethanol does not.

Phenol gives a violet colouration

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