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0rG@nIc cH3mI$trY......

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Deadly_king:
salaam every1.......

well...........i ws luking through my notes when i discovered something lacking.................i then consulted the text books but there ws nothing abt that there 2.

Guess i'll try my luck here.... :)

Its abt halogenoalkanes.....................it is said that they undergo nucleophilic substitution reaction.

However primary halogenoalkanes undergo SN2 mechanism while tertiary ones undergo SN mechanism............bt wat abt secondary halogenoalkanes???

Does any1 have a clue???
if yess, plz let me knw

feel free 2 leave ur comments, opinions, advice n tips  ;D

nid404:
http://www.chemguide.co.uk/mechanisms/nucsub/whatis.html

This will clear your doubts :)

Deadly_king:
hey thanks dr...........it really helped me  :)

Deadly_king:
Hmm...........I don't know if it's mentioned in the syllabus but i've got a question in a 2007 paper. So I just thought of clearing my doubts with your help.

Nitration of benzene requires concentrated nitric acid as reagents.
Conditions : Temperature < 60oC and Concentrated Sulfuric acid as catalyst.

However for the nitration of a phenol same conditions are applied except that dilute nitric acid is used.

Anyone has the slightest idea??

Is it because phenol carries an electronegative oxygen atom on one of its carbon atom which withdraws the electron clouds towards itself. Hence the other carbon atom develop a partial positive charge which allows it to substitute a hydrogen atom for a NO2 electrophile.

Can anyone confirm if my theory is correct??

nid404:
The OH group is electron releasing. It increases the electron density of the delocalised system, making substitution much easier compared to benzene

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