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![[Post New]](/templates/default/images/icon_minipost_new.gif) 23 Mar 2008 19:58:59 IST
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Single Answer Question: Which of the following gives phthalic anhydride on reaction with conc. H2SO4 in the presence of Hg? (a) Napthalene (b) Phenol (c) p-xylene (d) m-xylene guys first of all tell me what is phthalic anhydride and what happens in the reaction with conc. sulphuric acid in presence of Hg... Rates assured
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23 Mar 2008 20:03:29 IST
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I think it oxidises...but i am not sure...and if it oxidises,then i think the answer will be a...naphthalene
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MaNuTd RoXxXx..MaNuTd 2 WiN PrEmIeR LeAgUe ThIs SeAsOn ToO AlOnG WiTh ChAmPiOnS LeAgUe.....HaiL RoNaLdO ...HaiL LaMpArD... |
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23 Mar 2008 20:05:27 IST
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 Pthalic anhydride
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23 Mar 2008 20:08:51 IST
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naphthalene is correct... but how naphthalene on oxidation produce the above compound?
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23 Mar 2008 20:10:56 IST
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yeah its napthalene i hope you remember the use of HgSO4 /H2SO4 in the preparation of aldehydes and ketones from alkynes and alkenes this is a similar way for napthalene but i would prefer to use V2O5 for the above preparation !!!! is my answer correct???elasti boy's stucture explains it!!!
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23 Mar 2008 20:11:27 IST
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hello reply!!!!
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23 Mar 2008 20:12:25 IST
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I am in +1. I haven't done the chemistry of aldehyde and ketone
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23 Mar 2008 20:12:42 IST
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hey you know the mechanism of action of HgSO4 /H2SO4 no similar mechanistic approach one ring gets cleaved!!!
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23 Mar 2008 20:13:13 IST
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napthalene surely..
edit:
u can tell from structur itself
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Nitwit Blubber Odment Tweak
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23 Mar 2008 20:15:51 IST
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oh ok then take this note terminal alkenes aon treatment with HgSO4/H2SO4 a strong oxidising agent gives rise to formation of C=O group leading to aldehyde formation otherwise it gives a ketone when in the middle sometimes it may even give rise to a ether so here's it the two bond in the second ring of napthalene cleave to give rise to two C=O groups with a -O- linkage forming pthalic anhydride is it ok???
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23 Mar 2008 20:25:51 IST
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but in structure of naphthalene given by elastiboysai, there are only four carbons in the second ring.
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23 Mar 2008 20:26:58 IST
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i mean in which there is oxygen
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hey there are only two carbons in the second ring and the other one is oxygen the other carbons which you think are lost from the napthalene are as by product in the form of CO2!!!! now understood!!!???? thats also oxidation no!!! remember HgSO4 is a very good oxidising agent!!!!
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23 Mar 2008 20:34:24 IST
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hello sahil???
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23 Mar 2008 20:36:35 IST
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done
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