Question

For the following compounds, write structural formulas and IUPAC names for all possible isomers having the number of double or triple bond as indicated: 

(a) C₄H₈ (one double bond) 

(b) C₅H₈ (one triple bond) 

Answer 1

(a) The following structural isomers are possible for C4H8 with one double bond: 

The IUPAC name of 

Compound (I) is But-1-ene, 

Compound (II) is But-2-ene, and 

Compound (III) is 2-Methylprop-1-ene. 

(b) The following structural isomers are possible for C5C8 with one triple bond: 

The IUPAC name of 

Compound (I) is Pent-1-yne, Compound 

(II) is Pent-2-yne, and 

Compound (III) is 3-Methylbut-1-ene.