Q.Draw the structure corresponding to the IUPAC name 3-methylpentan-2-ol, and state whether it is primary, secondary or tertiary.

Alcohols ($\text{R--OH}$) are IUPAC-named with the '-ol' suffix on the longest chain containing the $-\text{OH}$ carbon, numbered to give it the lowest locant, and classed as primary/secondary/tertiary by how many other carbons attach to that $-\text{OH}$-bearing carbon. They are prepared from alkenes by acid-catalysed hydration (Markovnikov addition of water via a carbocation intermediate), from haloalkanes by nucleophilic substitution with aqueous hydroxide (clean $S_N2$ for a primary substrate), and from carbonyl compounds by hydride reduction ($\text{NaBH}_4$/$\text{LiAlH}_4$: an aldehyde gives a primary alcohol, a ketone gives a secondary alcohol) or by Grignard addition (which alone can build a tertiary alcohol directly from a ketone).