In which of the following .compounds -OH is the functional group? [NCERT Exemplar] (a) Butanone (b) Butanol (c) Butanoic (d) Butanal

Answer: (b) Butanol, CH3—CH2—CH2—CH2—OH The general formula of alcohols is CnH2n+1— OH. For butanol, n = 4. So, formula is C4H9—OH or CH3—CH2—CH2—CH2—OH