Explanation:

Only codes 1,2&4 are correct.

• In corporate finance, a debenture is a medium- to long-term debt instrument used by large companies to borrow money, at a fixed rate of interest. The legal term "debenture" originally referred to a document that either creates a debt or acknowledges it, but in some countries the term is now used interchangeably with bond, loan stock or note. 

• A debenture is thus like a certificate of loan or a loan bond evidencing the company's liability to pay a specified amount with interest. Although the money raised by the debentures becomes a part of the company's capital structure, it does not become share capital.

• A debenture is a financial instrument that is used by a lender, such as a bank, to provide capital to businesses and individuals. It allows the lender to secure loan repayments against the borrower's assets – even if the borrower fails to make the payment.

• A debenture can impose either a fixed or floating charge. A fixed charge is typically imposed on a tangible asset, such as real estate.

• Debentures are debt financial instruments issued by private firms that are not backed by any collateral or real assets.

• Debenture is a debt instrument and freely transferable. It makes a part of company’s capital but its holders are not able to participating in the voting in the annual general meetings. Hence option 4th is correct.