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[Post New]14 Nov 2007 01:04:54 IST
    Subject: free radial stability
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kislay (1108)

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pls solve

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[Post New]14 Nov 2007 01:08:17 IST
    Subject: free radial stability
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kislay (1108)

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i want to ask how stability of 5 and 3 has been compared?????
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[Post New]14 Nov 2007 01:16:06 IST
    Subject: free radial stability
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rooney (894)

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5 has more resonance structures than 3. so its more stable.
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[Post New]14 Nov 2007 01:34:57 IST
    Subject: free radial stability
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kislay (1108)

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HOW CAN U SHOW RESONANCE IN 5??
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[Post New]14 Nov 2007 11:05:07 IST
    Subject: free radial stability
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rooney (894)

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Hmmm...I dont get how V is least stable when it has max reso structures and the lone pair is getting delocalised maximum.
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[Post New]14 Nov 2007 11:55:50 IST
    Subject: free radial stability
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madman (239)

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no rooney
there is no lone pair delocalization in either of them.
look carefully the carbon is a free radical
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[Post New]14 Nov 2007 12:33:31 IST
    Subject: Re:free radial stability
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10904him (98)

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See in the other structures carbene may form in trying out resonance hence they are most unstable.Further onehaving three pi bonds in ring forces carbene formation more than the single bond ring.Hence the result................
 
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[Post New]14 Nov 2007 12:37:05 IST
    Subject: Re:free radial stability
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mukulss (493)

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in 5
aromaticity of benzene ring has damaged bcoz it now does not follw
(4n+2)pie syatem
so it is the least stable
others can be judged in different ways
hope u can make it now
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[Post New]14 Nov 2007 12:37:56 IST
    Subject: Re:free radial stability
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rooney (894)

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Been long since I did organic. Anyways, isnt this what happens ?
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[Post New]14 Nov 2007 13:18:31 IST
    Subject: free radial stability
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kislay (1108)

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@mukuluss, aromaticity gives extra stability to compounds than other comparable non aromatic compounds,and absence of it doesn'dt redues the stablity(than the nortmal value),isnt it????????
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[Post New]14 Nov 2007 13:25:33 IST
    Subject: free radial stability
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kislay (1108)

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@rooney
two consecutive double bond in any ring system is not possible, due to very high angle strain , so resonance shown by u are not possible.....
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[Post New]15 Nov 2007 14:20:27 IST
    Subject: Re:free radial stability
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madhusudan.chavan (826)

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Stability of free radical depends on i) Hyperconjugation and ii) resonance effect.
In case of IV & II resonance effect can expalin the stability.
In case of phenyl free radical no other structure would be possible hence is least stable.For structure III, one structure may be possible by using hydrogen atom on adjacent carbon( benzyne type triple bond). Hence III should be more stable than V. However, the same anology does not work for vinyl free radical, it is less stable than phenyl free radical.
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[Post New]15 Nov 2007 17:20:07 IST
    Subject: free radial stability
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kislay (1108)

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if triple bond resonance is possibnle in III tehn why it is not possible in V
???????
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[Post New]17 Nov 2007 00:59:30 IST
    Subject: Re:free radial stability
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santosh05 (279)

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v is aromatic     so it has to b most stable.......ans gvn is wrong
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[Post New]19 Nov 2007 12:09:50 IST
    Subject: Re:free radial stability
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nikss (4)

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