I need some one guidance to install ubuntu touch on my samsung galaxy tab 2 p3100 and i also wanna know what all app's supports it like whats's app, wechat, and wordpress ect.
There is an old build (Apr-2013), but you may still need to wait a few more weeks.
The number of devices support for daily builds is in the process of being extended.
Changes to phablet-flash will shortly support additional devices and sources, rather than some complicated install procedure more suited to XDA-developers (no slight intended).
Also look at: Ubuntu Touch Porting: next steps
The 'current status' for Galaxy Tab 2 7.0 (GT-P3100/P3110/P3113) can be found at:
https://wiki.ubuntu.com/Touch/Devices/p3100 (3G + WiFi)
https://wiki.ubuntu.com/Touch/Devices/p3110 (WiFi only)