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Organic Chemistry

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28 Jun 2007 22:27:32 IST

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Iodination-surely check this one-get rated

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In iodination of alkanes,iodic acid is used to

a)catalyse the reaction

b)remove HI by reduction and to prevent reverse reaction

c)oxidise HI to prevet the reverse reaction

d)to liberate free I₂ necessary for iodination

my sir told the answer to be B but i think the answer is C.
Which one is correct?

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Comments (9)

Marshall Eriksen

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28 Jun 2007 22:30:51 IST

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B is correct

HI is violently reactive and produces Alkyl halide immediately.....so HIO3 or HgO is used to remove it

Marshall Eriksen

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28 Jun 2007 22:35:13 IST

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reaction is as follows :

R - H + I2 <--------> R - I + HI (Reversible)

5 HI + HIO3 -------------> 3 I2 + 3 H20

arun-rashi

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28 Jun 2007 23:26:53 IST

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iodination of alkanes is reversable reaction due to formation of HI on right hand side which is a redusing agent so it reduce alkyl halide into alkanes.if we want to go in forward reaction it must ouccers in presence of any oxidising agent like HIO3 or HgO or HNO3 etc like if we use HIO3 ,HI converted into I2 and H2O.florination is exothermic and iodination is reversible so ideal halogenation are bromination or chlorination where bromination is better because it is more selective.

arun-rashi

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28 Jun 2007 23:29:16 IST

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so option c is correct because iodic acid oxidise HIor HI reduce iodic acid into iodine and water.

bhuvana........

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28 Jun 2007 23:29:24 IST

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ya even i think the answer is C.

Iodic acid is an oxidising agent..

so it will oxidise HI...and itself get reduced

Thus preventing reverse reaction..

aravindh ramaswamy

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29 Jun 2007 07:40:15 IST

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Yes,the answer is C.

MOHNISH

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29 Jun 2007 08:35:37 IST

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In Iodic acid,Iodine's oxidation number is +5 so in a rxn it will get reduce itself rather than getting oxidised.It is used in the Iodination rxn to remove the HI formed by oxidising it and getting reduced inorder to prevent the backward rxn of the Iodination.So answer is 'C'

Manish Nagdev

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29 Jun 2007 08:38:09 IST

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the correct ans is "c". HI is Oxidised by HIO3 ( Iodic) acid to form Iodine and water.

Siddhant Jena

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9 Jun 2012 12:49:05 IST

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Why bromination is better than chlorination?

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