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Smaller size and higher electronegativity favor pi-bonding in group 14. C (period 2) forms pi-bonds (e.g., in C₂H₄) more readily than Si, Ge, or Sn due to effective 2p orbital overlap.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electron Gain Enthalpy and Electronegativity and Valency
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