33) The electronegativity of C, H, O, N and S are 2.5,2.1, 3.5, 3.0, and 2.5 respectively. Which of the following is most polar?
149) The electronegativities of F, Cl, Br and I are 4, 0, 3, 0, 2, 8, 2, 5 respectively. Hydrogen halide with a high percentage of ionic character is