DEDUCTION FROM INCOME FROM HOUSE PROPERTY

While computing income from House Property, one of the deductions is , interest paid on borrowed capital, and it includes loan taken for purchase, construction, repair, renewal etc..so, if a personal loan is taken for the purpose of reconstruction or renewal, then is the interest paid on such personal loan allowed to be deducted as it is for the above mentioned purpose? If not then why? If yes then, the assessee can evade tax by misrepresenting the amount of loan taken for some other purpose and state that it belongs to the house propoerty renovation?