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Chemistry Question on Chemical bonding and molecular structure

The total number of species from the following in which one unpaired electron is present, is ____.
N2,O2,C2−,O2−,H2+,CN−,He2+\text{N}_2, \text{O}_2, \text{C}_2^{-}, \text{O}_2^{-}, \text{H}_2^{+}, \text{CN}^{-}, \text{He}_2^{+}

Answer

Step 1: Analyze each species for unpaired electrons

  1. N2_2: All electrons are paired.
  2. O2_2: Two unpaired electrons are present in antibonding orbitals.
  3. C2−_2^-: One unpaired electron is present.
  4. O2−_2^-: One unpaired electron is present.
  5. H2+_2^+: One unpaired electron is present.
  6. CN−^-: All electrons are paired.
  7. He2+_2^+: One unpaired electron is present.

Step 2: Count the species with one unpaired electron

Species with one unpaired electron:

C2−, O2−, H2+, He2+.C_2^-, \, O_2^-, \, H_2^+, \, He_2^+.

Total number = 4.

Thus, the correct Answer is 4.