Is it legal?

First clarify her status in the property.  You have mentioned that she is a co-applicant for loan, it means the title over the property is already conferred on her (?), If you have just used  her salary slip alone for the purpose of loan, she cannot claim any right over the property except her interests as a spouse of the title holder. The divorce petition will not entertain her application for stay restraining you from alienating or encumbering the property, there is no provision for that provided you are the absolute owner of the property.  If there is a home already where she resided and she is eligible to reside, that can be her matrimonial home hence as an absolute owner of the property you can go ahead with the disposal of the property as per your wish.

Thank you sir.....

I m the sole owner of the property.. Her name is nowhere mentioned in sale agreement /sale deed. Only her income has been shown along with my income to avail loan.So her name is appearing as co-applicant in loan agreement only. nowhere else. & that is also not our matrimonial home

In this situatation as per your guidence i assume that i can sell that flat at any point of time.

Thank you

Mr.Kalaiselvan has replied properly. When you are perfectly confirmed our doubts, you go a head for alienation. In the existing case, your wife could not be  able to seek  injunction against your flat.