Alkane Isomerism

What is structural isomerism in alkanes?

• Compounds with the same molecular formula and the same structural arrangement of atoms.

• Different compounds with the same molecular formula but different structural arrangements of atoms.

• Compounds with different molecular formulas and different structural arrangements of atoms.

• Compounds with different molecular formulas but the same structural arrangement of atoms.

How many structural isomers can be formed for pentane?

• 5

• 4

• 1

• 3

Can butane exhibit structural isomerism? If yes, how many?

• 5

• 3

• 2

• 4

What is the difference between normal butane and isobutane?

• Normal butane is a liquid, while isobutane is a gas.

• Normal butane is more flammable than isobutane.

• The main difference is their molecular structure: normal butane has a straight-chain structure, while isobutane has a branched-chain structure.

• Normal butane has a higher molecular weight than isobutane.

Draw the structural isomers for hexane.

• 2,3-dimethylbutane

• 2,2-dimethylbutane

• 2,4-dimethylbutane

• n-hexane, 2-methylpentane, 3-methylpentane

Explain the concept of branching in alkanes with an example.

• An example of branching in alkanes is 2-methylpropane, which is a branched isomer of propane.

• 3-ethylbutane is an example of branching in alkanes

• Branching in alkanes refers to the presence of double bonds

• An example of branching in alkanes is 1,2-dimethylpropane

Discuss the significance of structural isomerism in the study of alkanes.

• Structural isomerism in alkanes provides insights into the diverse properties that can arise from variations in molecular structure while keeping the same chemical formula.

• Structural isomerism in alkanes is only relevant for non-carbon compounds

• Structural isomerism in alkanes always results in the same chemical formula

• Structural isomerism in alkanes has no impact on their properties

What are the limitations of structural isomerism in alkanes?

• Hydrocarbons with different functional groups attached to the carbon chain

• Complex branched structures with multiple bonds between carbon atoms

• Simple linear structure with only single bonds between carbon atoms

• Cyclic structures with alternating single and double bonds