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![[Post New]](/templates/default/images/icon_minipost_new.gif) 23 Mar 2008 10:46:07 IST
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how to determine RDS in an organic reaction.suppose in ahoffmann bromamide reaction what is RDS
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23 Mar 2008 11:27:57 IST
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it is not to be determined...it has to be learnt...or else its given in the question....
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23 Mar 2008 11:32:51 IST
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The slowest step of a multistep rxn is the RDS Step.....
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23 Mar 2008 11:34:30 IST
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as u mentioned the organic rxns....Consider the EAS(electrophilic Arom Subs.)...in this rxn ,...the RDS or slowest step is the loss of aromaticity......generally its diff to guess a RDS unless it is mentioned in the ques....
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23 Mar 2008 15:27:48 IST
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Yes, Neeraj is right.
U cant determine the RDS urself, it has to be learnt. U must know it.
Waise, generally the formation of an intermediate is the RDS in most of the reactions.
Hope it helps U.
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23 Mar 2008 16:47:51 IST
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in hoffmann bromamide reaction:
the step from III to IV is the RDS
:)
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23 Mar 2008 16:56:30 IST
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gen intermediate formation is rds but in sum cases u have to learn n if ur master in organic then u can predict rds dats simple fact the rxn taht is backbone of mechanism will be rds for example leaving of gud l.g in many rxns or it may be a addition or subt, rxn as well hope u got it but in my opinion u shud learn u cant ake risks in xams hoe u got it plz rate if useful cheers!!!
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23 Mar 2008 18:37:28 IST
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Slowest step in a multi step reaction is the rate determining step. Generally it is mentioned in the reaction mechanism. While studying the mechanism we come across the r.d.s., try to remember it.
In the Hofmann bromamide reaction, the reaction is believed to occur through five steps ( one of the posting above has mentioned it). Formation of alkyl isocyanate is supposed to be the r.d.s. It has been isolated as reaction intermediate.Generally r.d.s being the slowest step it is possible to isolate the reaction intermediate (which are short lived and highly reactive). So we can infer from the intermediate which is isolated, the r.d.s.
Particularly for this reaction even the standard texts have avoided mentioning specifically the r.d.s.
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