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1. π

  • A. 9, 2
  • B. 9, 2
  • C. 9, 2
  • D. 9, 2

Answer: Option D

Explanation:

Sigma bonds (σ) are the first type of covalent bond, formed by overlap of atomic orbitals head-to-head. They are found in single, double, and triple bonds. Pi bonds (π) are the second and third types of covalent bonds, formed by overlap of p orbitals side-to-side. They only exist in double and triple bonds.

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