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The sun light is responsible to break down the halogens molecules into free radicals which are very reactive species and attack on alkane molecules and substitute the hydrogen atoms.

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Q: In halogenation of alkanes the reactions at room temperature is slow in dark while it is rapid in sunlight Why?
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Related questions

Is halogenation of alkanes a nucleophlic or electrophlic mechanism?

alkenes are neutral nucleofiles they undergoes electrophilic addition reactions.


Why don't alkanes undergo fluorination?

because halogenation of alkanes with fluorine is very violently exothermic i.e explosive in nature .


What is the physical state of the smallest alkanes at room temperature?

Alkanes with a carbon chain of 5 up to 17 are liquids. So the set of liquid alkanes begins with pentane, C5H12.


What reactions can be employed for getting unsymmetrical alkanes in good yield?

Corey-House reaction


What alkanes are gases at room temperature?

Lower alkanes are gases. As the number of carbon increases they are liquids and even solids.


What decolorises bromine in the absence of sunlight?

Organic compounds called Alkenes turns Bromine to colourless from orange-ish without sunlight as a catalyst. Alkanes however require sunlight to react.


Does propane undergo addition reaction?

Alkanes like (methane, ethane, propane etc.) … They do not undergo addition reactions


What are substitution reactions of Alkane?

Yes, it can be converted thermally or photochemically by dehydrogenation using iridium complexes as catalysts.


Why is alkane chemically inert?

Alkanes are not very reactive because of the stability of their bonds. The carbon hydrogen bonds found in alkanes are virtually nonpolar. Also, carbon and hydrogen have no lone pairs of electrons. This means that they are not subject to attack by nucleophiles or electrophiles.


What Difference between reactivity in hexane and cyclohexane?

Not much. Both are alkanes, and alkanes are highly unreactive. The only reaction for alkanes I can think of off the top of my head is free radical halogenation, but both hexane and cyclohexane have secondary carbons, so reactivity is comparable. Of course, cyclohexane has 6 secondary carbons while hexane only has 4, so you can make the argument that cyclohexane is more reactive in this example.


Hydrocarbons which have only single bonds between carbon atoms?

All alkanes have single bonds.They consist of single bonds.


What is the equation for the reaction involved when the bromine is mixed with the ethyne?

The Nucleophilic substitution of Halo alkanes