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Q. define isomeries

Answer 1

An isomer of a molecule has the same number of atoms of each element, but has a different arrangement of the atoms.It has the same molecular formula as the other molecule, but with a different chemical structure. Isomers do not necessarily share similar properties, unless they also have the same functional groups. There are two main forms of isomerism : structural isomerism (or constitutional isomerism) and stereoisomerism (or spatial isomerism).

Answer 2

here your answer

a mapping of a metric space onto another or onto itself so that the distance between any two points in the original space is the same as the distance between their images in the second space rotation and translation are isometries of the plane.

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