Answer :
The decreasing bond length is H-I > H-Br > H-F.
What is bond length?
The bond length is the separation between the centres of two atoms that are covalently bound. The number of bonded electrons influences the length of the bond (the bond order). Higher bond orders are related to shorter bond lengths and stronger forces between the two atoms.
What is bond order?
The shared covalent bonds between two atoms. When two atoms share one pair of electrons, one bond (bond order = 1) is created. A double bond is made up of two pairs of electrons (bond order = 2), whereas a triple bond is made up of three pairs of electrons (bond order = 3).
H-I > H-Br > H-F
With increase in atomic size from F to I ,bond length of H----X
bond increases
Therefore, the decreasing bond length is H-I > H-Br > H-F.
Learn more about bond length from the given link.
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