# Which of the following molecular is the most polar?

$(a)\;CH_3NH_2 \\ (b)\;(CH_3)_3CCl \\(c)\;CH_3NO_2 \\(d)\;(CH_3)_3 CH$

The Lewis structure of $CH_3NO_2$ has a formal charge of $+1$ on nitrogen, making it more electron - attracting than the other structures .
Hence c is the correct answer.