See image — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

# SN1 and SN2 Reactivity Analysis **SN1 Reactivity** (increases with carbocation stability): - **Primary < Secondary < Tertiary** - Depends on: alkyl substitution at C-Cl, steric accessibility **SN2 Reactivity** (decreases with steric hindrance): - **Tertiary < Secondary < Primary** - Depends on: nucleophile attack accessibility (backside) --- ## Analyzing the structures: **(I) $CH_3CH_2CH_2CH_2Cl$** — Primary alkyl chloride - SN1: Very slow (unstable primary carbocation) - SN2: Fast (unhindered, nucleophile easily attacks) **(II) $CH_3CHCH(CH_3)Cl$** — Secondary alkyl chloride - Moderate carbocation stability → intermediate SN1 - Moderate steric hindrance → intermediate SN2 **(III) $CH_3CHCH_2Cl$ with $CH_3$ substituent** — Primary (with β-branching) - SN1: Slow - SN2: Slower than (I) due to β-branching **(IV) $(CH_3)_3CCl$** — Tertiary alkyl chloride - SN1: Fastest (stable 3° carbocation) - SN2: Slowest (severe steric crowding at C-Cl) --- ## Order: **SN1: I < III < II < IV** ✓ (matches option A) **SN2: IV < II < III < I** ✓ (matches option B) Both (A) and (B) correctly describe the respective trends, making **(C)** the correct answer. *(Note: Option A labels only SN1, but since both A and B are correct, answer is (C))*