a
Butan\(-1-\)ol \(\left( CH _3 CH _2 CH _2 CH _2 OH \right)\) can undergo hydrogen bonding. Ethoxyethane \(\left( CH _3 CH _2-\right.\) \(O - CH _2 CH _3\) ) has no hydrogen (attached with \(F\), \(O , N\) ) which can undergo hydrogen bonding. More is the extent of intermolecular \(H\)-bonding, more will be association of molecules. Thus leading to higher boiling point.Hence both Assertion \((A)\) and Reason\((R)\) are true and \(( R )\) is the correct explanation of \(( A )\).