The structures of all isomeric alcohols of C₅H₁₂O are given below:

(a)

Naming is done by the conventional method. The -OH group is attached on the first carbon.

(b)

3-Methylbutan-1-ol

Butane is the longest chain and methyl is the substituent group.

(c)

3-Methylbutan-1-ol

Longest chain is butane and conventional naming method is used.

(d)

2,2-Dimethylpropan-1-ol

Isomer is made by transforming the principal carbon into tertiary type. The longest chain is butane and named accordingly.

(e)

Pentan-2-ol

Longest chain is pentane and the numbering is chosen from the minimum position.

(f)

3-Methylbutan-2-ol

Butane is the longest chain, further numbering is done by choosing a minimum position for the -OH group followed by other substituents.

(g)

Pentan-3-ol

Conventional method of naming is used.

(h)

2-Methylbutan-2-ol

Butane is the longest chain and substituents are named accordingly by looking into minimum position.