Organic chemistry (isomerism): What type of isomerism exists between CH₃CHCl₂ and CH₂Cl–CH₂Cl (two dichloroethane isomers)? Compare the position of substituents on the same carbon skeleton. Choose the correct option.

Difficulty: Easy

Chain isomerism
Functional group isomerism
Positional isomerism
Metamerism

Correct Answer: Positional isomerism

Explanation:

Given structures

CH₃–CHCl₂ (1,1-dichloroethane)
CH₂Cl–CH₂Cl (1,2-dichloroethane)

Concept/Approach
Same carbon skeleton and same functional groups (halo), but different positions of substituents ⇒ positional isomerism.

Final Answer
Positional isomerism

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