According to molecular orbital theory, which of the following is most unstable molecule?
Correct answer: D. H2-2
- A. He2+
- B. H2-
- C. H2+
- D. H2-2
Explanation
MOLECULAR ORBITAL THEORY: It states that all the atoms tend to combine together and form molecular orbitals. It is basically a method for describing the electronic structure of molecules using quantum mechanics. The number of electrons present in all four options is shown below : We know that, greater the number of electrons present in an atom, the more unstable it is. Here, H₂⁻² has the maximum number of electrons. Thus, it is most unstable.
Last updated
About Sigma and Pi Bonds
A sigma bond forms by direct end-to-end overlap along the internuclear axis, whereas a pi bond forms by sideways overlap of parallel orbitals. The topic covers single, double and triple bonds, bond composition, restricted rotation and the relation between sigma and pi bonding and orbital hybridisation.
Practise Chemical Bonding
964 free Chemical Bonding MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.