BIOCHEMISTRY
POLAR AND NONPOLAR MOLECULES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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H < C < O
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H < O < C
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O < C < H
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C < H < O
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Detailed explanation-1: -The bonding pair of electrons will feel more attraction from the oxygen nucleus than from carbon, resulting in higher oxygen electronegativity.
Detailed explanation-2: -Carbon has an electronegativity of 2.5, while the value for hydrogen is 2.1. The difference is 0.4, which is rather small. The C–H bond is therefore considered nonpolar.
Detailed explanation-3: -Electronegativity values increase in period 2 in the order C < N < O < F. Electronegativity values decrease from top to bottom within a group of elements.
Detailed explanation-4: -O(N) interatomic distance was found for experimental (CSD base retrieved) data. The following rule is observed: the weaker the H-bond is, the more electronegative the OH group is. If apart from this kind of interaction the oxygen is proton accepting, then an increase of electronegativity is observed.