Question

Draw the structure and write down the IUPAC name for the isomerism exhibited by the molecular formulae:

1. C₅H₁₀ – Pentene (3 isomers) 

2. C₆H₁₂ – Hexene (5 isomers)

Answer 1

1. C₅H₁₀ – Pentene (3 isomers) 

(a) CH₃ – CH₂ – CH₂ – CH = CH₂ → 1- penlene (or) pent- 1-ene

(b) CH₃ – CH₂ – CH = CH – CH₃ → 2- pentene (or) pent-2-ene

2. C₆H₁₂ – Hexene (5 isomers) 

(a) CH₃ – CH₂ – CH₂ – CH₂ – CH = CH₂ → Hex-I-ene 

(b) CH₃ – CH₂ – CH₂ – CH = CH – CH₃ → Hex – 2 – ene 

(c) CH₃ – CH₂ – CH = CH – CH₂ – CH₃ → Hex – 3 – ene

These two compounds exhibits constitutional isomerism.