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B
functional
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C
geometrical
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D
chain
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Solution
The correct option is A position CH3−CH=CH−CH3CH2=CH−CH2−CH3 But-2-ene But-1-ene
But-1-ene and but-2-ene are called structural(postional) isomers because they have: same molecular formula (C4H8) different structural formula (position of double bond is differrent).