Draw the structure of isomers of:
(a) butane (b) pentane.
Write the IUPAC and common names of these isomers.
[2 MARKS]

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Solution

Each Part: 1 Mark

(a) Butane $(C_{4} H_{10})$ represents two chain isomers
$\begin{matrix} S t r u c t u r a l f o r m u l a & C o m m o n n a m e & I U P A C n a m e C H_{3} - C H_{2} - C H_{2} - C H_{3} & n - B u t a n e & B u t a n e C H_{3} - C | H C H_{3} - C H_{3} & I s o b u t a n e & 2 - M e t h y l p r o p a n e \end{matrix}$

(b) Pentane $(C_{5} H_{12})$ represents three chain isomers

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