[phymatter]

I have read that basicity is compared by equlibrium and nucleophilicity by kinetics , then how do we compare basicity with nucleophilicity ??
That is if there is a negatively charged molecule and H⁺ and a carbocation , how do we come to know which will be attacked by the negatively charged molecule ?

[azmanam]

depends on the reaction conditions.  start here:

http://www.chem.uky.edu/courses/che230/RBG/handouts/SNorE/SNorE_print.HTML
http://www.cem.msu.edu/~reusch/VirtTxtJml/alhalrx3.htm#hal9