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The correct option is D.
You might be confusing with 2 that one actually the same compound so it can not be structural isomer. You can check this by naming the compound by IUPAC that is 2-methly pentane.
I am attaching the summary of the structural isomer that might be helpful for you.
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Thank you so much. Could you also explain why 3 shows structural isomerism?
CH(OH)=CHCH2OH (Functional groups=> Alcohol and alkene)
Molecular formula: C3H6O2
CH3CH2COOH (Functional group=>carboxylic acid)
Molecular formular: C3H6O2
As both have same no of atoms and molecular formula and different structures so they are structural isomers.