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aromatic chem

orange unit

QuestionAnswer
Properties of benzene C6H6, unsaturated structure, cyclic.
Why was Kekule's structure proposed? hydrogenation of benzene suggests three C=C bonds
What were the problems with Kekule's structure? unsaturated; benzene does not undergo electrophilic addition, equal electron density and C-C bond lengths, hydration value is lower than experimental value.
What is the shape of molecule for each carbon atom in the benzene ring trigonal planar 120
How is benzene's delocalised electrons formed? 3 of carbons electrons are bonded in sigma bonds, 4th is in a 2p orbital above and below the plane of C, p orbitals overlap with p orbitals on either side and producing pi bonds all over the ring, DELOCALISED ELECTRONS!
What is required for the formation of the NO2+ ion? concentrated H2SO4 concentrated HNO3 50degreesC
What can be used as a halogen carrier in the formation of halogen+ Fe FeBr3 AlBr3
How do we test for the presence of a carbonyl 2,4 DNPH+methanol+sulphuric acid=Bradys reagent add to solution forming yellow/orange ppt if carbonyl group is present
How do we determine if it is an aldehyde or a ketone tollens reagent=NaOH(aq)+AgNO3(aq) and aq NH3 Aldehyde=silver mirror, oxidised to carboxylic acid Ketone= no reaction
Identifying carbonyl compound yellow/orange ppt. 2,4 DNPH, filtered and recrystallised, purified sample produced. filtered and dried. melting point measured and compared to database.
Created by: 07blandforderin
 

 



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