(iv)has been sentenced by a Criminal Court to imprisonment for a term exceeding two years for an offence which is declared by the Central Government to be such as to unfit him to become an elector or has been sentenced by a Criminal Court for any offence under Chapter IX-A of the Indian Penal Code (45 of 1860): Provided that any disqualification incurred by a person under clause (iv) shall terminate on the lapse of three years from the expiry of the sentence or order.