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Chemistry · Molecular Orbital Theory: Its important features, LCAOs, types of molecular orbitals (bonding, antibonding), sigma and pi-bonds

Which of the following molecules has two sigma \) and two pi \) bonds?

Which of the following molecules has two sigma \( (\sigma) \) and two pi \( (\pi) \) bonds?

  • A. \( C_{2} H_{4} \)
  • B. \( N_{2} F_{2} \)
  • C. \( C_{2} H_{2} C l_{2} \)
  • D. \( H C N \)

Step-by-step solution

In HCN, the molecule has a single bond (H-C) which contributes one sigma bond, and a triple bond (C≡N) which contributes one sigma and two pi bonds. Total: 2 sigma (1 from H-C + 1 from C≡N) and 2 pi bonds (both from C≡N). Other options have different bond counts: A (C2H4) has 5 sigma and 1 pi; B (N2F2) has 3 sigma and 1 pi; C (C2H2Cl2) has 5 sigma and 1 pi. Hence, only HCN fits the criteria.
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