Which bond is more polar in the following pairs of molecules: (a) `H_(3)C - H, H_(3)C-Br` (b) `H_(3)C - NH_(2), H_(3)C - OH` (c) `H_(3)C - OH, H_(3)C - SH`

Explanation

(a) C-Br since Br is more electronegative than H
(b) C-O since O is more electronegative than N (c) C - O since O is more electronegative than S.