Compare the B-B bond length in the following | vedclass

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(B) The molecules are $B_2F_4$ and $B_2Cl_4$. The bond length $y$ (in $B_2Cl_4$) is greater than the bond length $x$ (in $B_2F_4$).Fluorine is more el

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$y > x$

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(B) The molecules are $B_2F_4$ and $B_2Cl_4$. The bond length $y$ (in $B_2Cl_4$) is greater than the bond length $x$ (in $B_2F_4$).Fluorine is more electronegative than chlorine. In $B_2F_4$, the $B-F$ bond is highly polar, which increases the $s$-character in the $B-B$ bond due to Bent's rule (electronegative atoms prefer orbitals with more $p$-character, leaving more $s$-character for the $B-B$ bond). Higher $s$-character leads to a shorter bond length.Additionally, the back-bonding from $F$ to $B$ is more effective than from $Cl$ to $B$, which also influences the bond order and length. Experimental values confirm $x \approx 172 \ pm$ and $y \approx 175 \ pm$.Therefore, $y > x$.

Compare the $B-B$ bond length in the following molecules:

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