Question

For the following compound, write structural formula and IUPAC name for all possible isomers having the number of a double or triple bond as indicated:

C₄H₈ (one double bond)

Answer 1

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

(I) \[\ce{H2^1C = ^2CH - ^3CH2 - ^4CH3}\]

(II) \[\ce{^1CH3 - ^2CH = ^3CH - ^4CH3}\]

(III) \[\begin{array}{cc}
\ce{^1CH2 = ^2C - ^3CH3}\\
\phantom{..}|\\
\phantom{....}\ce{CH3}\end{array}\]

The IUPAC name of

Compound (I) is But-1-ene,

Compound (II) is But-2-ene, and

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