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Reaction mechanism of Acyl chlorides???
- Thread starter minafakes
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GUYS!! da recent papers r sooo hard!!
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you will NEVER be asked regarding the mechanism of acyl chloride (ethanoyl chloride).
another thing is that the mechanism is addition-elimination although nucleophilic substitution is accepted. Go to the mark scheme of J10/42 Q.1 (c)(ii). In this question the mechanism is not required but if you read the examiners' report then few students have quoted it. Nevertheless, your marks will no be lost.
ADDITION-ELIMINATION
You people have gone through the mechanism of nucleophilic addition on C=O in AS. like wise the detailed mechanism of SN1 and SN2 have also been introduced to you in AS, which brings to you the concept of leaving group. Now just remember that chloride ion (Cl-) is a good leaving group if the attacking nucleophile is hydroxide ion (OH-). good leaving group means that the bond between chlorine and Carbon is easily broken. On the other hand OH- is very strong nucleophile and therefore bonds strongly to Carbon in comparison to Cl- means that the Carbon will form a stronger bond with O of OH- than Cl-.
Hope u can design e mechanism using this information.
another thing is that the mechanism is addition-elimination although nucleophilic substitution is accepted. Go to the mark scheme of J10/42 Q.1 (c)(ii). In this question the mechanism is not required but if you read the examiners' report then few students have quoted it. Nevertheless, your marks will no be lost.
ADDITION-ELIMINATION
You people have gone through the mechanism of nucleophilic addition on C=O in AS. like wise the detailed mechanism of SN1 and SN2 have also been introduced to you in AS, which brings to you the concept of leaving group. Now just remember that chloride ion (Cl-) is a good leaving group if the attacking nucleophile is hydroxide ion (OH-). good leaving group means that the bond between chlorine and Carbon is easily broken. On the other hand OH- is very strong nucleophile and therefore bonds strongly to Carbon in comparison to Cl- means that the Carbon will form a stronger bond with O of OH- than Cl-.
Hope u can design e mechanism using this information.
FOR Chemistry PAPER 33!!!!!!!!!!
hydrated ammonim salt titrated with KMnO4
usual salt analysis
one thermal question
We have to titrate ammonium nitrate with KMn04 or would we need to oxidize potassium iodide in the
presence of ammonium nitrate and then titrate the resulting solution with sodium thiosulphate? :|
see question no.1 in june2008-31
a similar question is expected!
hydrated ammonim salt titrated with KMnO4
usual salt analysis
one thermal question
We have to titrate ammonium nitrate with KMn04 or would we need to oxidize potassium iodide in the
presence of ammonium nitrate and then titrate the resulting solution with sodium thiosulphate? :|
see question no.1 in june2008-31
a similar question is expected!