Question

(i) Draw the structures of all isomeric alcohols of molecular formula C₅H₁₂O and give
their IUPAC names.
(ii) Classify the isomers of alcohols in question 11.3 (i) as primary, secondary and
tertiary alcohols.

Answer 1

(i) The structures of all isomeric alcohols of molecular formula, C₅H₁₂O are shown below:

2-Methylbutan-2-ol (3°)
(ii) Primary alcohol: Pentan-1-ol; 2-Methylbutan-1-ol;
3-Methylbutan-1-ol; 2, 2−Dimethylpropan-1-ol Secondary alcohol: Pentan-2-ol; 3-Methylbutan-2-ol; Pentan-3-ol Tertiary alcohol: 2-methylbutan-2-ol