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    Halochromism in Phenolphthalein

    Thanks for whatever information you have given me.
  2. G

    Halochromism in Phenolphthalein

    Thank you sir. I was previously obsessed by the fact that a nucleophile doesn't attack a site which has pi electrons around it because in alkene chemistry we often see an electrophile attacking at pi electrons. But now it seems that a nucleophile could do so if it has enough of energy to...
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    Halochromism in Phenolphthalein

    Now probably I got the point. Phenolpthalein is acidic because it is phenol-pthalein and as the concentration of hydroxide ion increases in the reaction mixture a less stronger base eventually appears i.e.In(OH)3-. Is it just as simple as this?
  4. G

    Halochromism in Phenolphthalein

    Thank you sir for giving consideration to my post. But I would like to ask is it really so bad to have sp2 hybrid state that a nucleophile like hydroxide ion could approach you at a relatively low concentration of about 0.01M inspite of the fact that a powerful +R group like phenoxide ion...
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    Halochromism in Phenolphthalein

    Come on guys! I am still waiting for your response.
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    Halochromism in Phenolphthalein

    It is known that when pH of solution is greater than 12 phph solution turns colorless. And the structural change which occurs is I want to ask why OH_ group attack sp2 hybridized carbon atom attached to three different rings? How elecrophilic site is generated there? In one of its bonding...
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    Colour of complex compounds and crystal field theory

    Hello Drdu. When a coordination entity say [Cu(H2O)4]2+ absorb a photon and goes to exited state then what will happen to the next photon which is incidented on same coordination complex which it has absorbed earlier? Will it be reflected back because there is no electron available for d-d...
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    Colour of complex compounds and crystal field theory

    Hi It is know that the colour exhibited by coordinate compound is because of d-d electron transitions. These d-d transition lead to absorption of photons of a paticular frequence. AND when a electron become exited due to absorption of photon it should radiate electromagnetic wave of frequency...
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    Structure of SO2

    Thanks Drdu. But I think, I will have to work out mechanism myself.
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    Structure of SO2

    Drdu_Once again Thanks.:smile: The link provided by you helped me to understand what you wanted me to infer earlier. Now I am putting up some thought about which I am not completely sure. Formation of sulphut dioxide is a bimolecular process invoving one sulphur atom and one oxygen gas...
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    Structure of SO2

    Drdu_.Thanks, for posting such a incomplete answer! I have posted this thread so that I can come across people who really know the truth and don't hesitate to share that with other. But anyways, thanks for replying.
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    Structure of SO2

    Hi I was trying to understand the geometry of Sulphur Dioxide molecule on the basis of hybridisation involved in the central atom. I found that Sulphur atom should have SP2 hybridisation. I want to know that is there any promotion of electron from 3 p-orbitals to 3d-orbitals and then forming...
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