See image — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

# Hybridization of Carbon Atoms in 1-Allene ($C_3H_4$) **Structure of 1-Allene:** $$H_2C=C=CH_2$$ **Step 1: Identify the three carbon atoms** - C1 (terminal): $H_2C=$ - C2 (central): $=C=$ - C3 (terminal): $=CH_2$ **Step 2: Determine hybridization of C1 and C3** Each terminal carbon forms: - 2 σ bonds (one C=C double bond + two C-H bonds) - Total regions of electron density = 3 For 3 electron regions: hybridization = $sp^2$ **Step 3: Determine hybridization of C2** The central carbon forms: - 2 π bonds (two C=C double bonds with C1 and C3) - 2 σ bonds (perpendicular to each other, in different planes) - Total regions of electron density = 2 For 2 electron regions: hybridization = $sp$ **Conclusion:** The three carbons have hybridization types: $sp^2$ (C1), $sp$ (C2), and $sp^2$ (C3) Therefore, the allene contains **$sp^2$ and $sp$ hybridized carbons**. **Answer: (B)** ✓