Chemistry - GOC Question with Solution | TestHub

(A) Both are ${\mathrm{C}}_4{\mathrm{H}}_{10}\mathrm{O}$ alcohols with the $-\mathrm{OH}$ on a terminal carbon; only the carbon chain differs (straight against branched): chain isomerism. Correct.

(B) Butane and 2-methylpropane are ${\mathrm{C}}_4{\mathrm{H}}_{10}$ hydrocarbons with no functional group whose position can change. They differ in the carbon skeleton, so this is chain isomerism, not position isomerism. Wrong.

(C) ${\mathrm{C}}_2{\mathrm{H}}_6\mathrm{O}$: an alcohol and an ether have different functional groups: functional-group isomerism. Correct.

(D) Both are ethers (${\mathrm{C}}_4{\mathrm{H}}_{10}\mathrm{O}$) and differ in the alkyl groups on the two sides of the oxygen (methyl and propyl against two ethyl groups): metamerism. Correct.

Answer: (A), (C), (D).