RPA Flashcards
HNO3 and H2SO4 as catalyst in nitrification of benzene
HNO3 + 2H2SO4 -> NO2^+ + 2HSO4^- + H3O^+
Test for aldehyde
Tollens’ = silver mirror
Test for carboxylic acid
Carbonate = effervescence
Retention time
The time taken from injection of the sample for the component to leave the column
Reasons to not have stereoisomers
- production of single isomer more expensive
- one of the isomers may be toxic
Alpha amino acid
Both NH2 and COOH are joined to the same C
Evidence against Kekule’s structure of benzene:
- Bond length different from short C=C, long C-C
- enthalpy change if hydrogenation less ectothermic than expected
- only reacts with Br2 at high temperatures and with a halogen carrier
Why Cr2O7^2- over MnO4^-?
Ecell for MnO4^- is more positive than “species A”
MnO4^- reacts with “species A”
Under what circumstances can an optical isomer form?
If a chiral carbon is present
What are the chemicals needed to nitrate a benzene ring?
HNO3 and H2SO4
What are the reagents needed to halogenated a benzene ring?
FeCl3 or AlCl3
And Cl2
What are the reagents needed to animate a nitro group on a benzene ring?
Sn and HCl
Tests for ketones?
How to test which ketone if multiple could be chemical?
2,4-DNPH, orange ppt
Tollens’ reagent, no reaction
Purify 2,4-DNPH derivative and measure melting point. Compare to database
H H O
OH—C—C—-C—OH
H H
Eliminate H2O
H OH
C==C
H COOH
H OH
C==C
H COOH
Reduce
H. H
C==C
H CH2OH
