[H2 Chemistry] - Misc TYS qns

UltimaOnline SG

In Alevel_2011_P3

Q1(e) When amides undergo hydrolysis

RCONH2 + OH- ---> ROO- +RNH2

Why is it not the case for the last reaction? Also what is the role of Br2 in the last reaction?

Thanks

Because of a Uni level reaction mechanism known as the Hofmann rearrangement (which is of course beyond the H2 syllabus, but since part d of the Qn was talking all about it and giving you the info you need, you should therefore suspect part e of the Qn might be linked to part d) :

https://en.wikipedia.org/wiki/Hofmann_rearrangement

BCME SG

With reference to A-level_2010_P1, Q40.

What makes the COCHCl2 group not be able to participate in an iodoform reaction with alkaline iodine? Is it due to the amide group? So all the amide group C=O are not considered is it?

UltimaOnline SG

With reference to A-level_2010_P1, Q40.

What makes the COCHCl2 group not be able to participate in an iodoform reaction with alkaline iodine? Is it due to the amide group? So all the amide group C=O are not considered is it?

-_-"

Only now (after P2 & P3 over liao, only left P1) then you know this ah? Carboxylic acids, esters & amides do *not* undergo the iodoform reaction, only ethanal (among the aldehydes), alcohols with CH3-CH(OH)-R and ketones with CH3-CO-R undergo the iodoform reaction.

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