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Sometimes more than one valence structure is possible and there shows to be no unique assignment. A familiar organic example is in the disposition of single and double C-C bonds in benzene. In the carbonate ion 11) the three structures shown are equivalent by symmetry, and experimentally all three C-O bonds have same length. We describe this situation as resonance between the different structures, and represent it by the double headed arrows shown in 11. The term is misleading as it suggests a fast oscillation between different structures, which certainly does not happen. It is better to think of a wavefunction that is contracted by combining the structures, none of which on their own describe the bonding correctly.
11
Resonance may also be appropriate with different valence structures that are not equivalent but look equally plausible, as in nitrous oxide (N2O 12).
Cis-1-ethyl-3-methylcyclohexane can be isolated in optically active form.
Co2 is isostructural with: (1) SnCl 2 (2) So 2 (3 ) HgCl 2 (4) All the above ans: HgCl 2
Uses of Iodoform or tri-iodomethane (a) Iodoform is utilized as a fire extinguisher under the name pyrene. Dense vapours form a protective layer on the burning objects and avoi
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Calculate the free energy change of following reaction at298 kelvin H2+I2=2HI if the enthalpy change is 51.8816kj and the entropy change is 166.15j is this reaction thermodyanamica
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The temperatre of an air bubble while rising from bottom to surface of lake remains constant but its diameter is doubled . if the pressure is equivalent to h meter of mercury colum
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