Differentiate between the following acids :
(a)
(b)

Explanation

Treat all acids with `Cl_2//P` or `Br_2//PBr(H.V.Z)` reaction.
(I) does not have `alpha-H` and would not react with `Cl_2//P`.
(II) has one `alpha-H` amd would give a monochlorinated product.

(III) has two `alpha-H` and would give a dichlorinated product.

The chlorine content in the chlorinated compound of `(B)` and `( C)` is determined by quantative methods.