21.2.1. Subject to section 21.3, where two or more persons, in this section referred to as the “transferors”, dispose of shares of the capital stock of a particular corporation in exchange for shares of the capital stock of another corporation, in this section referred to as the “acquiring corporation”, control of the acquiring corporation and of each corporation controlled by it immediately before the exchange is deemed to have been acquired at the time of the exchange by a person or group of persons unless(a) the particular corporation and the acquiring corporation were related, otherwise than because of a right referred to in paragraph b of section 20, to each other immediately before the exchange; or
(b) if all the shares of the acquiring corporation’s capital stock that were acquired by the transferors on the exchange were acquired at the time of the exchange by one person, the person would not control the acquiring corporation.