Question
Write the structural formulae for the following IUPAC names: Butanoic acid
✓
Answer
(1) But stands for 4 carbon atoms in a chain. Number the carbon atoms in a chain as 1, 2, 3,….
$\stackrel{4}{\mathrm{C}}-\stackrel{3}{\mathrm{C}}-\stackrel{2}{\mathrm{C}}-\stackrel{1}{\mathrm{C}}$
'-oic acid' stands for functional group - $\mathrm{COOH}$. Assign the number 1 to carbon in the functional group $-\mathrm{COOH}$.
$\stackrel{4}{\mathrm{C}}-\stackrel{3}{\mathrm{C}}-\stackrel{2}{\mathrm{C}}-\stackrel{1}{\mathrm{COOH}}$
Now satisfy the valencies of each carbon atom
$\stackrel{4}{\mathrm{C}}-\stackrel{3}{\mathrm{C}}-\stackrel{2}{\mathrm{C}}-\stackrel{1}{\mathrm{C}}$
'-oic acid' stands for functional group - $\mathrm{COOH}$. Assign the number 1 to carbon in the functional group $-\mathrm{COOH}$.
$\stackrel{4}{\mathrm{C}}-\stackrel{3}{\mathrm{C}}-\stackrel{2}{\mathrm{C}}-\stackrel{1}{\mathrm{COOH}}$
Now satisfy the valencies of each carbon atom
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