Appearance of blood red colour on treatment of the sodium fusion extract of an organic compound with FeSO4 in presence of concentrated H2SO4 indicates the presence of element(s).
N & S
N
To determine which elements are present in the organic compound based on the appearance of a blood red color, let's consider the chemistry involved in the test mentioned.
This leads us to conclude that the appearance of a blood red color confirms the presence of both nitrogen and sulfur in the original organic compound.
Correct Answer: N & S

The appearance of a blood red color upon this reaction indicates the presence of both nitrogen and sulphur in the compound, as they combine to form thiocyanate ions (SCN−), which react with Fe3+ to produce Fe(SCN)3 with the characteristic blood red color.
So, the correct answer is : N & S.
The correct increasing order of stability of the complexes based on \( \Delta \) value is:
Match List-I with List-II: List-I

Let \( C_{t-1} = 28, C_t = 56 \) and \( C_{t+1} = 70 \). Let \( A(4 \cos t, 4 \sin t), B(2 \sin t, -2 \cos t) \text{ and } C(3r - n_1, r^2 - n - 1) \) be the vertices of a triangle ABC, where \( t \) is a parameter. If \( (3x - 1)^2 + (3y)^2 = \alpha \) is the locus of the centroid of triangle ABC, then \( \alpha \) equals:
Designate whether each of the following compounds is aromatic or not aromatic.

Organic Compounds can be classified into:
The classification of organic compounds is based on structure such as: