explain and draw the detail diagram of the pin to pin connection of IC 8051 microcontroller with 2K RAM and 8K?

RAM starting address is 2000H while EPROM starting address is 5000H. Design chip-select signal circuit accordingly..

You can probably use a 74x138 from A12,A13,A14 and tie the appropriate OC outputs together, a pull-up and the chip _selects. But first check for on-chip decoding. I don't know details of the 8051 that well.