S. 13 : Denial of exemption-Trust or institution-Investment restrictions-Interest free loan given to two consultants as per terms of employment-No violation-Exemption cannot be denied–Benefit to interested persons in violation of section 13(1)(c)-Only that part of income which is in violation of section is chargeable to tax at maximum marginal rate of tax; but not whole income of trust. [S. 11, 13(1)(c), 13(3)(cc)]