MHTCET 17 Apr 2026 Shift 1 Paper

Concept:In a homologous series, successive members differ by a $-\mathrm{CH}_{2}-$ unit, called a methylene group.Explanation:A homologous series is a group of organic compounds with the same functional group and the same type of carbon skeleton.All members show similar chemical properties because the functional group remains identical.However, consecutive members differ by a methylene group, $-\mathrm{CH}_{2}-$, not an ethylene group, $-\mathrm{C}_{2}\mathrm{H}_{4}-$.For example, alkanes: $\mathrm{CH}_{4}$, $\mathrm{C}_{2}\mathrm{H}_{6}$, $\mathrm{C}_{3}\mathrm{H}_{8}$.Each next member differs by adding $-\mathrm{CH}_{2}-$.The ethylene group is $\mathrm{C}_{2}\mathrm{H}_{4}$, which is not the repeating unit in a homologous series.Thus, the statement claiming a difference by an ethylene group is incorrect.Option A, B, and D are true statements about homologous series.Only option C contains the false statement.Answer:The NOT true statement is Option C: "Each member differs by ethylene group from the next member."