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Which of the following statement is/are ...

Which of the following statement is/are wrong?

A

Beilstein test is a reliable test for halogens in organic compounds.

B

In Lassaigne's test for N, Prussian blue colour is due to the formation of ferro-ferri cyanide.

C

When `FeCl_3` solution is added to the Lassaigne's extract, a blue solution is obtained which indicates the presence of both N and S.

D

Molecular mass of an acid `=` Equivalent mass `xx` acidity

Text Solution

Verified by Experts

The correct Answer is:
A, B, C, D
(a). Sometimes test fails: urea, thiourea pyridine also gives.
(b). It is due to the formation of ferriferrocyanide `Fe_4[Fe(CN)_6]_3`.
(c). Blood-red colour is obtained.
(d). Molecular mass of an acid `=Ewxx`basicity.
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