What is the order of reactivity of halogen and alkyl groups in the dehydrohalogenation of alkyl halides to give alkenes ?

The reactivity of halogens :- The above order in case of halogens is due to the fact that the size of fluorine is small which makes a strong bond with carbon of alkyl group, thus makes it difficult to break.

But on the other hand in case of Iodine the bond between Iodine and Carbon is quite weak and its bond dissociation enthalpy is also quite low. Thus this bond can break easily and it makes the alkyl iodides more reactive.

Reactivity order of alkyl groups :-

The dehydrohalogenation reaction involves the formation of Carbocation. Out of primary , secondary and tertiary Carbocation, the tertiary Carbocation is most stable because it’s charge is compensated by the three alkyl groups attached to it. Thus the 3⁰ (tertiary) carbocation is highly reactive.

Published by ankushmaster

I am M.Sc (chemistry ) from punjabi university. I am a science teacher with expertise in chemistry, with 8 years of experiance in teaching. i am getting a handsome salary , now i wish to help out the people who need me UNCONDITIONALLY. and I am constantly working on creating a new and easy way of learning the tough things in an effective way. I am constantly working to make authentic and reliable information to be shared with my students and widen the horizons of knowledge.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.

%d bloggers like this: