Chain & Positional Isomerism: Same Formula, Different Shape!

The video tutorial explains isomerism, a phenomenon where compounds with the same molecular formula exhibit different physical and chemical properties. It discusses two main types: structural isomerism, which involves changes in the relative arrangement of atoms, and stereoisomerism, which involves spatial arrangement changes. Structural isomerism is further divided into six types, including chain and positional isomerism. Chain isomerism is characterized by different carbon skeletons, while positional isomerism involves changes in the position of functional groups or bonds. Examples are provided to illustrate these concepts.

What is the term for compounds with the same molecular formula but different properties?

• Isotopes

• Isomers

• Polymers

• Allotropes

Which of the following is NOT a reason for isomerism?

• Change in spatial arrangement of atoms

• Change in relative arrangement of atoms

• Change in atomic number

• Change in molecular formula

What type of isomerism involves compounds with the same molecular formula but different structures due to atom arrangement?

• Optical isomerism

• Geometric isomerism

• Structural isomerism

• Stereoisomerism

Which type of structural isomerism involves a change in the carbon skeleton?

• Metamerism

• Positional isomerism

• Chain isomerism

• Functional isomerism

Which of the following compounds is an example of chain isomerism?

• Benzene

• 1-chloropropane

• 2-chloropropane

• n-butane

What is the main characteristic of positional isomers?

• Different carbon skeletons

• Different functional groups

• Different positions of functional groups or bonds

• Different molecular formulas

In dichlorobenzenes, what causes the compounds to be positional isomers?

• Different types of bonds

• Different positions of chlorine atoms

• Different molecular formulas

• Different carbon skeletons