Define structural isomerism
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Structural isomerism, also known as constitutional isomerism, is a form of isomerism where compounds have the same molecular formula but differ in the arrangement of atoms within the molecule. In other words, structural isomers have different connectivity or bonding patterns between atoms. This can result in different properties and chemical reactivity. Examples of structural isomers include n-butane and isobutane, which both have the molecular formula C4H10 but have different structural arrangements.