Given below are two statements: Statement I: A π bonding MO has lower electron density above and below the…
Chemical Bonding · Class 11 · JEE Main Previous Year Question
Given below are two statements:
Statement I: A π bonding MO has lower electron density above and below the inter-nuclear axis.
Statement II: The π* antibonding MO has a node between the nuclei.
Choose the most appropriate answer:
- a
Both Statement I and Statement II are false
- b
Both Statement I and Statement II are true
- c✓
Statement I is false but Statement II is true
- d
Statement I is true but Statement II is false
Statement I is false but Statement II is true
🧠 Analyse the electron density distribution in bonding and antibonding MOs.
Statement I: "π bonding MO has lower electron density above and below the internuclear axis" → False. A bonding MO is formed by sideways (lateral) p-orbital overlap — it has concentrated electron density above and below the internuclear axis (in two lobes). This is the defining feature of a π bond: electron density is not between the nuclei but around them perpendicularly.
Statement II: "π antibonding MO has a node between the nuclei"* → True. The π* MO has destructive interference in the internuclear region, creating a nodal plane between the nuclei. This reduces electron density between the nuclei, weakening the bond.
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