practical 6 Flashcards
1
Q
Alkenes
A
Orange to Colourless.
reason fpr obs: Electrophilic addition of Br2 to alkene.
reagent :Bromine Water
2
Q
1° Alcohols
2° Alcohols
Aldehydes
A
Orange to Green
reagent; acidified K2Cr2O7
reason for obs: Cr2O72− (orange) reduced to Cr3+ (green) when
alcohol/aldehyde oxidised
3
Q
Aldehydes
A
r:tollen’s Reagent
obs:Silver mirror forms
reason for obs : Ag+ in Tollen’s reagent reduced to Ag(s) when
aldehyde oxidised
r:Fehling’s Solution
obs:Brick-red ppt. forms
reason:Fehling’s solution reduced when aldehyde oxidised
4
Q
Carboxylic Acids
A
Sodium Carbonate
obs:Effervescence
reason:Formation of CO2
5
Q
Br
A
silver nitrate
obs:ppt
6
Q
OH and -CHO
A
acidified K2Cr2O7
solution turns green
