MCQ
Compare $B—B$ bond length in following molecules :
- A$x > y$
- ✓$y > x$
- C$x = y$
- DNone of these
✓
Answer
Correct option: B.
$y > x$
b
The bond length y is greater than the bond length x. The bond length y is 175 pm and the bond length $\mathrm{x}$ is $172 \mathrm{pm}$.
The bond length y is greater than the bond length x. The bond length y is 175 pm and the bond length $\mathrm{x}$ is $172 \mathrm{pm}$.
Fluorine is more electronegative than chlorine. Hence, the electrons of $\mathrm{F}-\mathrm{B}$ bond are more towards $\mathrm{F}$ than the electrons of $\mathrm{Cl}-\mathrm{B}$ bond. Thus, the partial positive charge on $\mathrm{B}$ atom is more in fluoro derivative than in chloro derivative.
Hence, the attraction for the bond pair of electrons of $\mathrm{B}-\mathrm{B}$ bond is greater for the fluoro
compound than for chloro compound.
Hence, $\mathrm{y}>\mathrm{x}$
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