Distinguish between the following: 'Benchmarked instruments' and 'pure instruments'.

Benchmarked instruments are certain debt instruments wherein the fixed income earned is based on a benchmark. For instance the floating interest rate funds are benchmarked to either the LIBOR or MIBOR. Pure instruments are Equity shares, preference shares and debentures/bonds which were issued with their basic characteristics in tact without mixing features of other classes of instruments are called pure instruments.