An alcohol has the molecular formula C4H10O write the structural formulae of the isomers to show chain isomerism?

See the structural formulas below.

The two alcohols with four carbon atoms in a row are butan-1-ol

(from www.chem.purdue.edu)

and butan-2-ol

(from faculty.lacitycollege.edu)

The two alcohols with three carbon atoms in a row are 2-methylpropan-1-ol

(from www.chemhume.co.uk)

and 2-methylpropan-2-ol

(from ibchem.com)