1.8085 has multiplexed data lines where as Z80 does'nt has multiplexed lines.

2.8085 operates at 3-5MHz clock freq,But clock frequency of Z80 is 4-20MHz.

3.8085 contains 74 instructions and Z80 has 158 instructions.

4.8085 has 5 interrupts but Z80 has only 2.

5.8085 has no index register but Z80 has 2.

6.8085 contains SIM & RIM instructions, but Z80 does'nt .

draw the Z80 processor and explain five of its pin function

Z80 contained 8.500 transistors. See the site I linked below for more information.

The Z80 has 40 pins.

8 bit microprocessors