Transfer of Rights

After B's death no claimant had come that's ok but that alone will not give any title or right to Mr. A to alienate the property though he might have spent on improvements.  The best thing he could have done is he should have continued his stay another 10 years and later should have claimed the property under adverse possession. 

As per law if a property is left out without successors the property should belong to the Government. 

Now A, after doing all querry mentioned things, though out of ignorance, its better for him to keep quite "lest not trouble the trouble until the trouble troubles him"

I agree Sir

But as A has sold that property and have bought another property.

Can C claim the amount of consideration that as A was not having the legal right to sell the property ?

Can A be asked to pay the amount after 20 years he sold that property.

Regards

Himanshu

As you are a Company Secretary you might be knowing the legal maxim caveat emptor - The buyer must be careful and deligent before buying a property - If now C starts disputing about the property and shall the court should interfere in this.. the property will be reverted to the true owner.. i.e., in this case the Govt.  So its better for C to shut up and enjoy the property.

Your second querry is little bit a complicated - for a dispute yes it can be asked, but success dooms down on C.

u can sell to the extent only u own. u transfered only the possession of the property. the owership of the property may govt. or unknown. furthermore never say that u sold the property