Can I open Multiple adsense account for Multiple websites?

It is not necessary to open more than one account. One Account is suffecient for Multiple websites. You do not need to create 5 accounts for 5 different websites. If you live in the fear that if one account is closed down for violation of TOS, believe me they will close all accounts when they find out. You can keep track of clicks by using channels with real time statistics. They will automatically detect the new site and display relevant ads