Following the release of UC browser for PC I decided to test the new browser on various stuffs, on the process i discovered you can't chat on whatsapp on this awesome browser, so I came up with this tweak.
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those of you who haven't tried UC Browser for PC should give it a shot, it has lots of nice features
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in order to use whatsapp via whatsapp web on your UC Browser for PC, you have to download user-agent switcher(its a chrome extension that works on UC Browser PC).
After downloading and adding the user-agent switcher to your UC Browser you'll have to create a new user agent with this string; "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.94 Safari/537.36" after creating and activating the new user-agent you'll now be able to use whatsapp web on your UC Browser.

for a better explanation and direct download link of User-agent Switcher go to THE SOURCE