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Organic Chemistry – Some Basic Principles and Techniques
Question
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Which bond is more polar in the following pairs of molecules:

(i) H3C – H, H3C – Br

(ii) H3C – NH2, H3C – OH

(iii) H3C – OH, H3C – SH

Answer

(i) C – Br bond is more polar because Br is more electronegative than H.
(ii) C – O bond is more polar because O is more electronegative than N.
(iii) C – O bond is more polar because O is more electronegative than S.

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