Which of the following is not classified as a municipal bond?

The correct answer is that a debenture is not classified as a municipal bond. Municipal bonds are debt securities issued by state or local governments, or their agencies, to finance public projects. They typically include general obligation bonds, which are secured by the full faith and credit of the issuing authority, and revenue bonds, which are backed by the revenue generated from specific projects, such as tolls or utilities. Special tax bonds are another type of municipal bond, supported by taxes levied for particular purposes.

In contrast, a debenture is a type of long-term bond that is not secured by physical assets or collateral. It is backed only by the general creditworthiness and reputation of the issuer, which could be a corporation or a government entity, but it is not specifically tied to municipal finances. Therefore, while general obligation bonds, revenue bonds, and special tax bonds are all designed to serve municipal needs, debentures do not belong in this category, as they are distinct financial instruments.