Question
For the following compound, write structural formulas and IUPAC names for all possible isomers having the number of double or triple bond as indicated:
C4H8 (one double bond).
C4H8 (one double bond).
✓
Answer
$\text{H}_2\stackrel{1}{\hbox{C}}=\stackrel{2}{\hbox{C}}\text{H}-\stackrel{3}{\hbox{C}}\text{H}_2-\stackrel{4}{\hbox{C}}\text{H}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{(I)}$
$\stackrel{1}{\hbox{C}}\text{H}_3-\stackrel{2}{\hbox{C}}\text{H}=\stackrel{3}{\hbox{C}}\text{H}-\stackrel{4}{\hbox{C}}\text{H}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{(II)}$
$\stackrel{1}{\hbox{C}}\text{H}_2=\stackrel{2}{\hbox{C}}-\stackrel{3}{\hbox{C}}\text{H}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\\ \ \ \ \ \ \ \ \ \ \ \text{(III)}$
The IUPAC name of
Compound (I) is But-1-ene.
Compound (II) is But-2-ene.
Compound (III) is 2-Methylprop-1-ene.
$\stackrel{1}{\hbox{C}}\text{H}_3-\stackrel{2}{\hbox{C}}\text{H}=\stackrel{3}{\hbox{C}}\text{H}-\stackrel{4}{\hbox{C}}\text{H}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{(II)}$
$\stackrel{1}{\hbox{C}}\text{H}_2=\stackrel{2}{\hbox{C}}-\stackrel{3}{\hbox{C}}\text{H}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\\ \ \ \ \ \ \ \ \ \ \ \text{(III)}$
The IUPAC name of
Compound (I) is But-1-ene.
Compound (II) is But-2-ene.
Compound (III) is 2-Methylprop-1-ene.
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