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← ScienceWhich bonding change occurs when UV radiation excites formaldehyde?
A)Electron density shifts to antibonding orbitals✓
B)Sigma bond strengthens due to pi-mixing
C)Dipole moment decreases along the carbon-oxygen axis
D)Hydrogen atoms form symmetric bridging bonds
💡 Explanation
UV photon absorption promotes an electron to a higher energy antibonding molecular orbital; because electron density in antibonding orbitals weakens the carbon-oxygen bond, the bond stretches and distorts. Therefore the stability decreases, rather than sigma bond strengthening or dipolar changes.
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