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Q.

To detect iodine in presence of bromine, the sodium extract is treated with NaNO2+ glacial acetic acid + CCl4. Iodine is detected by the appearance of

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a

 yellow colour of CCl4 layer 

b

 deep blue colour in CCl4

c

 brown colour in the organic layer of CCl4

d

 purple colour of CCl4

answer is B.

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Detailed Solution

2NaI+2NaNO2+4CH3COOH⟶I2+2NO+4CH3COONa+2H2O

The colour of CCl4 layer turns purple due to liberated I2.

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