Capital and revenue reserve!!

In simple term, a capital reserve is normally derived from the appreciation of the company's assets or from capital gain on disposal of capital assets while revenue reserve is normally derived from the business activity, a retained profit. For example, an appreciation in the value of the company's property is normally regarded as a capital reserve. When the company has a profit gained on business operating, this profit, wholly or partly, could be transferred to a separate reserve account either used for capitalization of it for share capital or could be distributed as dividend only to the shareholders in future.
For corporate finance purpose, debenture is simply a medium or long-term debt instrument issued to any person and not necessary a shareholder of the company. There is a fixed return to the debenture holders say, 3 % p.a. on the borrowed capital sum. Debenture holders have no voting rights and the interest paid to them is a charge against profit of the company. The debenture holder is not entitled to any dividend or capitalization issues of shares.

Basic difference between Capital Reserve and Revenue Reserve is that capital reserve are not distributable as dividend while revenue reserve can. Example of capital reserve is share premium and revenue reserve is the retained earnings.
Debenture is a debt instrument issued for the purpose of raising finance. Debentures can be convertible into shares upon condition of issuance. The advantage of investing in debentures rather than ordinary shares is that it has fixed rate of return irrespective of economic condition. In case of convertible debentures, holder can even speculate on share price as well.