(1) This Chapter shall not apply—
(2) If the Central Government is of the opinion that having regard to the financial position of any class of establishment or other circumstances of the case, it is necessary or expedient so to do, it may, by notification and subject to such conditions, as may be specified in the notification, exempt, whether prospectively or retrospectively, that class of establishments from the operation of this Chapter for such period as may be specified in the notification.