Understanding Isomerism

What is the main characteristic of isomeric compounds?

• They have different physical states.

• They have the same structural formula.

• They have different molecular formulas.

• They have the same molecular formula but different structural formulas.

Which of the following is a correct IUPAC name for a butane isomer with a branch?

• Propane

• Butane

• 2-Ethylbutane

• 2-Methylpropane

How many carbon atoms are present in pentane?

• Three

• Four

• Five

• Six

When drawing isomers of pentane, why can't a branch be attached to the first or last carbon?

• It would change the molecular formula.

• It would create a new element.

• It would create a double bond.

• It would become part of the longest chain.

What is the molecular formula of butene?

• C4H10

• C4H8

• C3H8

• C5H10

In alkenes, what feature distinguishes different isomers?

• The type of functional group

• The number of carbon atoms

• The position of the double bond

• The presence of a triple bond

How many isomers does pentene have?

• Five

• Four

• Three

• Two

What must be added to complete the structural formula of an isomer?

• Chlorine atoms

• Nitrogen atoms

• Hydrogen atoms

• Oxygen atoms

Why is it important to avoid drawing duplicate isomers?

• It saves paper.

• It ensures all unique structures are identified.

• It changes the molecular formula.

• It reduces the number of bonds.

What is the significance of the longest carbon chain in naming isomers?

• It changes the physical state.

• It determines the molecular weight.

• It alters the chemical properties.

• It defines the base name of the compound.