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FeCl3 solution on reaction with SO2 chan...

`FeCl_3` solution on reaction with `SO_2` changes to:

A

`FeCl_2`

B

`Fe_2(SO_4)_3`

C

`Fe_2(SO_3)_3`

D

`FeSO_4`

Text Solution

Verified by Experts

The correct Answer is:
A
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(i) How will you convert phenol to benzoic acid? (ii) An organic compound A having molecular formula, C_6H_6O gives a characteristic colour with aqueous FeCl_3 solution. A on treatment with CO_2 and NaOH at 400 K under pressure gives B which on acidification gives a compound C. The compound C reacts with acetyl chloride to give D which is a popular pain killer. Deduce the structure of A, B, C and D.

Why FeCl_3 solution is acidic ?

When SO_2 is passed in acidified potassium dichromate solution, the oxidation state of S is changed from :

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Acidified K_2Cr_2O_7 solution changes to when SO_2 gas is passed through it.