answersLogoWhite

0


Best Answer

KMnO4 will add across the double bond of alkenes (or alkynes) resulting in the docolouring of KMnO4 but not an alkane such as ethane.

User Avatar

Wiki User

11y ago
This answer is:
User Avatar
More answers
User Avatar

Wiki User

13y ago

KMnO4 reacts with localized pi bonds as in alkenes and alkynes, in benzene there are delocalized pi bonds (pi electronic cloud) so KMnO4 can not react.

This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: Why benzene cannot decolourize KMnO4 while alkenes can decolorize?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

Why is suger insoluble in benzene?

Its just because of the reason that a non polar (benzene) compound cannot mix polar(sugar).


What is the chemical formula of chlorobenzene?

Benzene is equal parts hydrogen and carbon, and has C6H6 as it molecular formula. It is actually a ring with the carbons in the middle and the hydrogen bonded one-to-one with the carbon atoms on the outside. Use the link below for more information and to see a "picture" that cannot be drawn here.


Are alkenes saturated or unsaturated?

No, they are unsaturated as they contain double bonds


What is alkanes and alkenes?

The difference between an alkane and an alkene is that: Alkanes have only single bonds between carbon atoms and are said to be saturated: when put in bromine water, the bromine water stays orange - formula: CnH2n+2; Alkenes: have one or more double bond(s) between carbon atoms and are unsaturated: when put in bromine water, the bromine water turns clear - formula: CnH2n.


Why does benzoic acid form a dimer in benzene and not in water?

Benzene is a non polar solvent with low dielectric constant, whereas water is a polar solvent with high dielectric constant. So water can reduce the interaction between benzoic acid molecules there by preventing them from dimerizing, which cannot be done by benzene


Why benzene undergo electrophilic substitution reaction easily and nucleophilic substution reaction with difficulty easily and?

the electron in benzene are delocalised making d ring to be elctron rich,thereby undergoing electrophilic substitution.benzene cannot undergo nucleophillic substitution,it can only undergo if it is substituted with an electron withdrawing group


Explain why the Friedel-Crafts reaction of benzene plus n-propyl chloride in the presence of AlCl3 gives mostly isopropylbenzene?

rearrangemet because primary carbocations cannot form


Why hydrochloric acid does not ionise in methylbenzene?

Methyl benzene, or toluene, does not have a lone pair of electrons and so cannot act as a base and take the hydrogen ion away from the HCl molecule.


Why in benzene c-c bond lengths is same?

It is in constant resonance. I.e. the double and single bonds constantly switch so fast, that you cannot give an accurate length of a bond.


Why is benzene not considered a cycloalkene?

First of all a cycloalkene could be many things, such as, cyclopentane, cyclohexane or like. If you mean the difference between cyclohexene and benzene, then there is the double bound, 3 of a kind in a benzene molecule.


What are alkanes?

Answer Alkanes are saturated hydrocarbons having a general formula CnH2n+2. Alkanes are unreactive comparing to alkenes, they are not affected by acids or alkalies. But they burn well in a good supply of oxygen, forming carbon dioxide and water vapour. giving out plenty of heat.


Why is NaOH used in oxidation using KMnO4?

KMnO4 is called as potassium permanganate.uses of KMnO4it is used as an oxidizing agenthelps in converting alkenes into diolsit also acts as an antisepticfor the synthesis of organic compounds...!!