How differ intel i5 and dual core processors? what features are in both?
It's not about the difference, i5 is a series name in the Intel product line. Where dual core is just a chip with two processors.
i5 is just a series name, being Intel’s mid-range line of CPUs. Dual core just means that there are basically two processors on one chip.
I think both of the processors are true dual core processors. Intel never uses the term 'duo', this is just to confuse the customers I guess.