See image — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

# Chirality Analysis A compound is chiral if it contains a **stereogenic center** (carbon atom bonded to four different groups). **Option (1) - Butane:** $CH_3CH_2CH_2CH_3$ - All carbons have at least two identical groups → No stereogenic center → **Achiral** **Option (2) - 1-chloro-2-methyl butane:** $CH_3CH_2CH(CH_3)CH_2Cl$ - The carbon at position 2 is bonded to: $H$, $CH_3$, $CH_2Cl$, and $CH_2CH_3$ - All four groups are **different** → Stereogenic center present → **Chiral** ✓ **Option (3) - 2-methyl butane:** $CH_3CH(CH_3)CH_2CH_3$ - The carbon at position 2 is bonded to: $H$, $CH_3$, $CH_3$, and $CH_2CH_3$ - Two methyl groups are identical → **Achiral** **Option (4) - 2-methyl propane:** $(CH_3)_3C$ - Central carbon bonded to three identical methyl groups → **Achiral** **Answer: (2)** 1-chloro-2-methyl butane is chiral because it possesses one stereogenic center with four distinct groups attached.