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Organic Chemistry

SiNcY...'s Avatar
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Joined: 1 Oct 2007
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20 Oct 2007 09:18:12 IST
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acidiy of hydro carbons..............
None

How to find acidity (comparitive) for molecules such as these:
 
CH3CCH
CH3CH=CH2
CH3CH2CH3
 
like how to arrance them in ascending order of acidity?
plz help.....


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Comments (5)


Cool goIITian

Joined: 9 Oct 2007
Posts: 73
20 Oct 2007 11:10:02 IST
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sp is more electro negetive than sp2 which more elctro- ve than sp3

Cool goIITian

Joined: 9 Oct 2007
Posts: 73
20 Oct 2007 11:12:45 IST
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I think it is b a c the decresing order.......as secod one it is allylic alpha carbon not sure .............
kavisha khandelwal's Avatar

Hot goIITian

Joined: 24 Aug 2007
Posts: 106
20 Oct 2007 14:58:07 IST
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the increasing acidity order is
CH3CH2CH
CH3CH=CH2
CH3CCH
this is due to increasing s character
arun-rashi's Avatar

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Joined: 19 Oct 2006
Posts: 1057
20 Oct 2007 19:02:08 IST
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as the s charecter of orbital increase electron are drown closer to nucleus so electrnegativity increase so sp>sp2>sp3 is E N order so alkyne is maximum acidic than alkene than alkane.
kasirajan's Avatar

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Joined: 20 Jan 2007
Posts: 472
20 Oct 2007 19:20:26 IST
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i think the correct order would be..
CH3CCH>CH3CH=CH2>CH3CH2CH3
bcos...s character of the orbital increases , electrons r attracted or drawn nearer to the nucleus due to which the electronegativeity is more in alkyne thn in alkene and alkane...
hence the acidity is more in alkynes rather thn in alkenes and alkanes..



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