Medium Practice — Set 1

Quick Recap — Naming, Unsaturation & Isomer Counting

• Degree of unsaturation $=\dfrac{2C+2+N-H-X}{2}$ (each ring or pi bond counts as one).
• Structural isomer counts: $C_4H_{10}\to2$, $C_5H_{12}\to3$, $C_4H_9Br\to4$, $C_3H_8O\to3$.
• Acidity and $-I$: electron-withdrawing groups near $-COOH$ raise acidity (e.g. $ClCH_2COOH>CH_3COOH$; more/closer $Cl$ $\Rightarrow$ stronger acid).
• Functional-group priority decides the suffix; number for the lowest locant to that group.