Which type of debentures are repayable on the winding-up of a company or on the expiry of a long period?

Redeemable Debentures Convertible Debentures Zero Coupon Rate Debentures Irredeemable Debentures

Irredeemable Debentures

Irredeemable debentures are also known as Perpetual Debentures because the company does not give any undertaking for the repayment of money borrowed by issuing such debentures. These debentures are repayable on the winding-up of a company or on the expiry of a long period.