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Benzaldehyde

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by

Mohammed Attia

on 19 October 2014

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Transcript of Benzaldehyde

Benzaldehyde
General Class Reaction:
Structure
Physical Characters
Condition
Liquid, mobile, true liquid
Colour
Colourless
Odour
Bitter almond odour
Miscibility
Immiscible with water
(Heavier than water)
Immiscible with dil HCl
Immiscible with 10%NaOH
L.P: Neutral
Action of Sodalime (CaO+NaOH):
Action of 30% sodium hydroxide:
-On cold: No action
-On Hot:Cannizzaro reaction
Action of Conc.Sulphuric:
-On cold: Red color
-On Hot: No action
Action of ferric chloride:
No change
Not done
1- Schiff's reagent: Faint magenta red color
2- Tollen's reagent: Silver mirror
3- Fehling reagent: No change in color
1- Cannizzaro reaction: White ppt
2- Auto-oxidation test: Crystals of benzoic acids
4- Phenyl hydrazine test: Yellow solid product
Thanks for your attention
Done by:
Mohammed Attia
Schiffs Base
Special test:
Step1:
Add 1ml Aniline
+ 1ml Benzaldehyde
Mix till homogeneity
W.B
2min
Step2:
Cool under water then put in ice bath
till formation of Buff crystals
Don't miss the equation and mehanism
Procedure:
1ml AgNO3
+1ml NaOH
Black ppt
Black ppt
Add NH4OH drop wise
till dissolve Black ppt
Add 1ml unkown
W.B
Till formation of
silver mirror
Step1:
Step2:
Step3:
Procedure:
1ml unk
+1ml Fehling A
+1ml Fehling B
5- NaHSO3 test: White Solid product
Procedure:
Put 1 drop of unk and leave it in air
Preparation
Procedure:
W.B
Full transcript