You say that they are core i3 and i5 respectively, but this gives the impression that you are planning on using the CPUs for mining. Are you planning on GPU or CPU mining? What are your electricity costs? These two questions alone would go a long way towards telling you whether or not you should even consider it.
But i have heared that MENORO is the only currency which you can mine on laptops. what do you say?
I wouldn't say there are really any currencies that are suitable to be mined with laptops; I have a very high-powered gaming laptop with a modern graphics card. The card and the CPU just simply do not push enough power for it to be significant enough to be worth the time. If you for whatever reason do not have electricity cost, it might be reasonable to mine a CPU or GPU on a very low TDP or maintaining a very low temperature on the machine. Laptops overheat extremely quickly and do not push the type of power needed for it to be worth it to begin with.