The complex can be broken by adding 10% bicarbonate sol until no bubbles of CO2 is seen , followed by extraction with ether solvent

Dear Manoj Gaur,

The addition of bisulfite is usually employed to purify aldehydes. Aldehydes are isolated from reaction mixtures through its bisulfite derivatives. The addition compound can be split easily to regenerate the aldehyde by treating it with either dilute mineral acid or dilute alkali.

Reference link: http://chem2all.blogspot.com/2009/03/addition-of-bisulfite-to-aldehydes.html

I hope it will solve your problem.

Regards.

Muhammad Imran

Thanks for your suggestions. i am trying to isolate benzaldehyde from a solution. Benzaldehyde does form bisulfite adduct but i am not able to get free benzaldehyde after treatment with dilute alkali as well as dilute acid.

Please investigate the informations given by the links

http://www.google.com/patents/EP0066113A2?cl=en

https://www.researchgate.net/publication/11677446_A_Novel_Nonaqueous_Method_for_Regeneration_of_Aldehydes_from_Bisulfite_Adducts

https://books.google.ae/books?id=RIyuNVeObs0C&pg=PA887&lpg=PA887&dq=stable+bisulphite+regeneration+of+aldehyde+from&source=bl&ots=ZkLory-J6Q&sig=hffMBF-Qw0BwixFYhHRrawVFEuM&hl=en&sa=X&ei=EQTsVLXiOIT5UOKqgOAE&ved=0CDsQ6AEwBA#v=onepage&q=stable%20bisulphite%20regeneration%20of%20aldehyde%20from&f=false

Article A Novel, Nonaqueous Method for Regeneration of Aldehydes fro...