ULFAT
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Isomerism is the phenomenon whereby certain compounds, with the same molecular formula, exist in different forms owing to their different organisations of atoms. The concept of isomerism illustrates the fundamental importance of molecular structure and shape in organic chemistry. The effect is used in a qualitative way and describes the electron withdrawing or releasing properties of substituents based on relevant resonance structures and is symbolized by the letter M. The mesomeric effect is a permanent effect and operates in compounds containing at least one double bond and another double … In colorimetry, metamerism is the matching of the color of objects as humans perceive them without matching their spectral power distribution. Colors that match this way are called metamers.