S. 13 : Denial of exemption-Trust or institution-Investment restrictions-Substantial interest-Capital gain-Founder trustee of assessee-trust was holding only 0.83 per cent of aggregate paid-up ordinary share capital of TSL-No violation of provision-Investment in redeemable preferential shares-Entire income of trust shall not become ineligible for exemption, it was to be restricted only to income derived from prohibited investments. [S.11, 12A, 13(1)(d), 13(2)(h), 80G]