Question

what are isomers?
isomers are compounds with the same number of carbon atoms, but they have different number of hydrogen atoms
isomers are compounds with the same number of hydrogen atoms, but they have different number of carbon atoms
isomers are compounds with the same exact chemical formula, but they have completely different structures.
isomers are compounds with the same general chemical formula (e. g. cₙh₂ₙ), but they have different n
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part b
give some examples.
check all that apply.
methane and butane
butane and isobutane
ethane and propene.

Explanation:

Isomers are defined as compounds with the same chemical formula but different structures. For the examples, butane (\(C_4H_{10}\)) and isobutane (\(C_4H_{10}\)) fit the isomer definition as they have the same formula but different structures. Methane (\(CH_4\)) and butane (\(C_4H_{10}\)) have different formulas. Ethane (\(C_2H_6\)) and propene (\(C_3H_6\)) also have different formulas.

Answer:

For the first question: Isomers are compounds with the same exact chemical formula, but they have completely different structures.
For the second question: Butane and isobutane.