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Question 3

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

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-yne.

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