BIOCHEMISTRY
POLAR AND NONPOLAR MOLECULES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following shows the correct order of increasing polarity?
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N-H < C-H < H-O < H-F
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H-F < H-O < N-H < C-H
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H-F < H-O < C-H < N-H
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C-H < N-H < H-O < H-F
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Explanation:
Detailed explanation-1: -The greater the difference in electronegativities between two bonded atoms, the greater the polarity of the bond; so, the order of increasing polarity is S–F, P–F, Ge–F, Ga–F.
Detailed explanation-2: -As the electronegativity difference of bond increases, the polar character also increases. So the correct order will be: H2S<NH3<H2O<HF.
Detailed explanation-3: -Thus, both H-F and H-I bonds are polar covalent bonds. But, electronegativity values decrease down a group and fluorine and iodine belong to the same group (Group 17) of the periodic table. Thus, fluorine is more electronegative than iodine and so H-F bond will be more polar than H-I bond.
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