UNSATURATION TEST FOR ALKENES

A test for the presence of C=C where the purple colour of the KMnO4 decolourised and brown precipitate of MnO2 is formed. This reaction is called _______________

• reaction with bromine in dichloromethane

• Baeyer's test

• combustion

• solubility

What will happen when bromine is added to ethene? (as long as the ethene is present in excess)

• reddish brown colour of bromine dicolourised

• reddish brown colour of bromine remain unchanged

Which reagent was used in Baeyer's test?

• Br2

• KMnO4

• KMnO2

• CH2Cl

What can be formed ?

• CH3CHBrCH2Br

• CH3CHClCHCl

• CH3CH=CH(Br) + HBr

• CH3CH(Br)=CH2Br

______________ which undergoes _____________ reaction with or without sunlight.

• cyclohexene - substitution

• cyclohexane - substitution

• cyclohexene - addition

• cyclohexane - addition

potassium permanganate in alkaline solution can be used to oxidise _____________ to 1,2 -diols

• alkenes

• alkanes