નીચેનામાંથી સંયોજનમાં $B-F$ બંધની લંબાઈ સૌથી ટૂંકી છે?
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c $(c)$ Only in $BF_3\, \,p \pi - p \pi$ back bonding is possible due to which $B-F$ bond length is shortest. In other compounds, $p-$ orbital at boron is not vacant hence, $p \pi - p \pi$ back bonding is not possible. Water molecules are hexagonally closed pocked in ice with the help of $H-$ bonds, hence due to existance of voids/interstitial spaces it has cage like structure with less density than water.
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$BeF _{2}, BF _{3}, H _{2} O , NH _{3}, CCl _{4}$ અને $HCl$, પૈકી શૂન્ય ન હોય તેવા (નોન ઝીરો) નેટ દ્વિધ્રુવ માત્રા સાથેના અણુઓની સંખ્યા $\dots\dots\dots$ છે.