See image — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

# Stability of Alkenes - Step-by-Step Solution **Identify the structures:** - **(I)** $CH_3-CH=CH-CH_3$ — but-2-ene (internal, conjugated) - **(II)** $(CH_3)_2C=C(CH_3)_2$ — 2,3-dimethylbut-2-ene (tetrasubstituted) - **(III)** $CH_2=C(CH_3)_2$ — 2-methylprop-1-ene (disubstituted) - **(IV)** $CH_3-CH=CH-CH_3$ — but-2-ene with methyl branch (trisubstituted) **Apply alkene stability rules:** Alkene stability increases with **degree of substitution** at the double bond carbons: $$\text{Monosubstituted} < \text{Disubstituted} < \text{Trisubstituted} < \text{Tetrasubstituted}$$ **Classify each:** - **(I)** Disubstituted (2 alkyl groups on $C=C$) — LOW stability - **(III)** Disubstituted (2 alkyl groups on $C=C$) — LOW stability - **(IV)** Trisubstituted (3 alkyl groups on $C=C$) — MEDIUM stability - **(II)** Tetrasubstituted (4 alkyl groups on $C=C$) — HIGHEST stability **Stability order:** $I < III < IV < II$ **Answer: (A)**