Which of the following is the best criteria of purity of organic compounds?

Which of the following is the best criteria of purity of organic compounds?
[A]Melting point
[B]Mixed melting point
[C]Colour
[D]Microscopic examination

Mixed melting point
Mixed melting point is considered to be the best criteria for purity of a substance. The purified sample is mixed with a small quantity of pure compound and melting point of mixture is determined. If melting point of mixture is same as that of the pure compound, the sample compound is pure, otherwise it requires further purification.

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