You can execute GPA in his favour, valid all over India except J&K.

PoA can be given to execute all contracts, deeds, mortgages, lease, sell and all matters relating to managing the property. You can execute registerd Gpa in favour of your son. 

Yes it valid if registered and stamped properly

You can execute specific POA in Bangalore for properties lying in West Bengal 

POA should be registered in Bangalore 

Yes GPA registered in Banglore is valid to sign and execute sale deed in West Bengal.

PoA can be registered anywhere in India .

Yes, this can be done. You'll have to execute  GPOA in Bengaluru in favor of your son, and get it duly rwgisregis in the office of the competent sub registrar. However, since you do not have the local Bengaluru address on any of your address proofs, getting this GPOA registered in Bengaluru is tough.

1. It's possible to get the General Power of Attorney registered in Bangalore by you appointing your son as the Agent, for the properties located in West Bengal.

2. By executing a GPA, your son can represent on your behalf in various Government Offices, including the District/Sub Registrar's Office located in West Bengal.

1. Unless and until you have address proof of Bangalore then the GPA done in Bangalore would not be effective in WB.

2. In that event you will have to travel once to WB, make the GPA and then return to Bangalore once leaving your son to do the rest of selling on its basis.

Dear Sir,

Yes, you have give power of attorney to you son and it is valid and it can applicable to whole india and more over it is registered general power of attorney and it is valid to all the states.

Yes you can execute a GPA deed in favor of your son in Bangalore to sell the property located in WB.

He  can very well execute a registered sale deed in favor of prospective buyers on the basis of this registered GPA deed.

1.  A Duly Stamp Duty paid (500/-) and Registered (1000/-)  Power of Attorney (POA) is valid throughout India, for all transactions. There is no restrictions on the same.

A Power of Attorney executed by two indian citizens anywhere in India, is valid through out India. You as a senior citizen want to give a POA to your son, who is a joint owner with you in West Bengal for some properties. You can execute and register a POA here in Bangalore and he can use it in West Bengal. No issues whatsoever.

1. As per the information mentioned in the present query, makes it clear that you both have all the valid documents.
2. In fact, even after the judgment of the Hon’ble SC wherein restricting the GPA or POA for property transaction, you can go ahead and execute the same in favour of your son.
3. As there is an exception in the SC ruling that if the GPA or POA or SPA has been executed in the favour of a close relative then it would be admissible in law.
4. And yes, you can get it registered in the place where you are right now and then same can be used in another state also.