The correct order of increasing bond strength is S - HI<S - Cl<SI - Br
Bond orders go up and bond strengths go up, but bond distances go down. The sum of the covalent radii of the two atoms indicates about how long the link between them is. Indicated in picometers is bond length. As a result, the length of bonds increases from triple bonds to double bonds to single bonds. The more electron pairs there are in a bond between two atoms, the stronger the link becomes. This leads us to the conclusion that triple bonds are both stronger and shorter than double bonds between the same two atoms, and that double bonds are both stronger and shorter than single bonds between the same two atoms.
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