Chemistry - STEREO ISOMERISM Question with Solution | TestHub

The first Newman is butan-1-ol, $\mathrm{HOC}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_3$; the second is butan-2-ol, $\mathrm{C}{\mathrm{H}}_3-\mathrm{CH}(\mathrm{OH})-\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_3$. Both have molecular formula ${\mathrm{C}}_4{\mathrm{H}}_{10}\mathrm{O}$ and the same straight carbon skeleton; only the position of the $\mathrm{OH}$ group on the chain differs - this is positional isomerism. It is not conformational (not interconvertible by rotation), not chain (nuclear) isomerism (same skeleton), and metamerism requires different alkyl groups around a heteroatom.