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![[Post New]](/templates/default/images/icon_minipost_new.gif) 23 Jan 2008 09:23:28 IST
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Q1. Which effect is given more preference resonance effect,inductive effect ,hyperconjugation,electromeric effect if all these factors come into action in a question. q2.what is ortho effect and steric inhibtion effect??
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23 Jan 2008 10:22:58 IST
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1.)first of all you've got to understand that these are all involved with electron displacement...............so depending upon the type of electron displacement the effects come into play.........at no point 1effect overpowers the other..........
but for some cases a carbon chain may show a combination of 2 effects...........
for instance , a carbonyl group getting attached to a cyanide grp..........
shows predominantly -E effect but to define the overall properties we do also mention +I effect since cyanide gives away its electrons to the carbonyl grp acco to induction.............
thus , dont get conused with these effects.........the qs asked will prompt predominantly only 1 of these effect as the answer depending upon the type of electron displacement
2>)orto effect is a method to define strength of acidity in benzoic acids............every benzoic acid which is orto substituted are stronger acids than benzoic acid...........irrespective of the nature of the substitutent (e- donating or withdrawing)..
steric inhibition effect also called steric hindrance effect is when a particular group in a molecule shows less reactivity due to a rigid geometry preventing attack of other reactants.......and hence inhibiting further reaction...............
ex - a tert comound will show less reactivity than a neo or an iso compound....
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" the only thing thats always constant in this world , is change itself.....
so it is better to adapt to the situation or life makes you adapt to it (painfully)..."
- Kundan a.k.a Juan dankh......
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23 Jan 2008 13:51:57 IST
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Q1- Hyperconjugation>Resonance>Inductive
Always use these effects in these priorities. U will always get correct answers.
Q2-Explained by kundan_leo
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
http://tarinbansal.blogspot.com/
Posts:
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Some myths about Chemical Engineering.
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23 Jan 2008 18:16:45 IST
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nope...its resonance>hyperconjugation>inductive effect
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24 Jan 2008 09:34:33 IST
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guys wich order is correct?rishabh or wich tarinbansal said?plz clarify...
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24 Jan 2008 09:54:59 IST
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rishab is correct
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24 Jan 2008 10:46:30 IST
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Hey guys! chill! The right answer is resonance>hyperconjugation>inductive effect... Rate me if your'e smart!
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<TR><TD>
<DIV ALIGN="right">Glitter Graphics</DIV></TD></TR></TABLE>
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