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Question

The electronegativity of F, O, N, Cl and H are 4.0, 3.5,3.0,3.2 and 2.1 respectively. The strongest bond between the following will be:

A
FO
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B
OCl
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C
NH
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D
OH
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Solution

The correct option is D OH
More the EN difference between two bonded atoms, stronger will be the chemical bond between them.

In other words, we can say that:

Bond strength Δ EN between two bonded atoms

Hence, checking the EN difference between the two atoms, We get:

(a) FO=4.03.5=0.5
(b) OCl=3.53.2=0.3
(c) NH=3.02.1=0.9
(d) OH=3.52.1=1.4

Since, OH has the highest electronegativity difference, Hence, it will have the strongest bond.

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