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The outer orbitals of C in ethene molecule can be considered to be hybridized to give three equivalent sp2 orbitals. The total number of sigma (σ) and pi (π) bonds in ethene molecule is

1. 1 sigma (σ) and 2 pi (π) bonds
2. 3 sigma (σ) and 2 pi (π) bonds
3. 4 sigma (σ) and 1 pi (π) bonds
4. 5 sigma (σ) and 1 pi (π) bonds

Correct answer: 5 sigma (σ) and 1 pi (π) bonds

Solution

In ethene (C2H4), each carbon forms three sigma bonds (two with hydrogen and one with the other carbon) and one pi bond (due to the double bond between the carbons). This totals 5 sigma and 1 pi bond.

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