Classify the isomers of alcohols in question 3. (i) as primary, secondary and tertiary alcohols.


(A) Primary alcohol



Explanation



(i) Pentan-1-ol


(ii) 2-Methylbutan-1-ol


(iii) 3-Methylbutan-1-ol


(iv) 2,2-Dimethylpropan-1-ol



The -OH group is attached to the carbon that is attached to another single carbon.



(B) Secondary alcohol




(i) Pentan-2-ol


(ii) 3-Methylbutan-2-ol


(iii) Pentan-3-ol



The -OH group is attached to the carbon that is attached to another two carbons.



(C) Secondary alcohol




(i) 2-Methylbutan-2-ol



The -OH group is attached to the carbon group that is further attached to another three carbon atoms.




3