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Organic Chemistry

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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:

CH₃C

CH₃CH=CH₂

CH₃CH₂CH₃

like how to arrance them in ascending order of acidity?

plz help.....

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viswesh Nrayanan

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Joined: 9 Oct 2007

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20 Oct 2007 11:10:02 IST

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sp is more electro negetive than sp2 which more elctro- ve than sp3

viswesh Nrayanan

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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

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20 Oct 2007 14:58:07 IST

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the increasing acidity order is

CH₃CH₂CH₃

CH₃CH=CH₂

CH₃C

this is due to increasing s character

arun-rashi

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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

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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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