(C) Fluorine is the most electronegative element and has the least tendency to form $p\pi-d\pi$ double bonds. Due to its small size and high electrone

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(C) Fluorine is the most electronegative element and has the least tendency to form $p\pi-d\pi$ double bonds. Due to its small size and high electronegativity,it forms only one oxyacid,which is $HOF$ (hypofluorous acid). In contrast,other halogens like $Cl$,$Br$,and $I$ form multiple oxyacids due to the availability of vacant $d$-orbitals.