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Biology and Chemistry Homework Help
HOMO-LUMO energy gap of compounds
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[QUOTE="Amitkumarr, post: 6366440, member: 679806"] [B]Homework Statement:[/B] Which of the following statements is/are correct? (a) The molecular orbitals are essentially identical to the relevant atomic orbitals at very high energy differences. (b) Dominantly ionic compounds of group I have HOMO-LUMO energy gap in visible region generally. (c) Coloured covalent diatomic molecules have HOMO-LUMO energy gap in ultraviolet region. (d) All of the above. [B]Relevant Equations:[/B] No relevant equations.Based on Molecular orbital theory. According to me Option A is a correct option because as the energy difference between two atomic orbitals increases, their interaction, and thus the value of E (or E*) decreases. Here, E is the energy difference between the bonding molecular orbital and the atomic orbital of lower energy , while E* is the energy difference between the antibonding molecular orbital and the higher-energy atomic orbital. As these values decrease, the molecular orbitals become more and more similar to the atomic orbitals from which they are derived. But what should be the correct answer for options B and C? The HOMO-LUMO energy gap of the given compounds lies in which region? Note: Answer is given as option A.Why options B and C are wrong? [/QUOTE]
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HOMO-LUMO energy gap of compounds
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