MCQ
Correct order of Lewis Acidic strength?
- ✓$BF_3 < BCl_3 < BBr_3 < BI_3$
- B$BF_3 > BCl_3 > BBr_3 > BI_3$
- C$BF_3 = BCl_3 = BBr_3 = BI_3$
- D$BF_3 > BCl_3 < BBr_3 > BI_3$
✓
Answer
Correct option: A.
$BF_3 < BCl_3 < BBr_3 < BI_3$
a
(i) On the basis of back bonding, smaller be the halide atom, more effective be the back bonding and show less tendency to accept a pair of electrons.
(i) On the basis of back bonding, smaller be the halide atom, more effective be the back bonding and show less tendency to accept a pair of electrons.
(ii) Size of halides increase down the group, hence the ability of back bonding decreases making the molecule more acidic.
Hence, correct order of Lewis acid for boron-halides is $\mathrm{Bl}_{3}>\mathrm{BBr}_{3}>\mathrm{BCl}_{3}>\mathrm{BF}_{3}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Which of the following is polar molecule?
Which of the following options is the correct order of relative stabilities of cations $I, II$ and $III$ as written below (most stable first) ?
→$(II)\,\,\,{{H}_{2}}C=CH-C{{H}_{2}}-\overset{+}{\mathop{C}}\,H-C{{H}_{3}}$
$(III)\,\,\,\begin{matrix}
\,\,\,\,\,C{{H}_{3}}\, \\
|\, \\
{{H}_{3}}C-C-\overset{+}{\mathop{C}}\,{{H}_{2}} \\
|\, \\
\,\,\,C{{H}_{3}} \\
\end{matrix}$
For the system $2A(g) + B(g)$ $\rightleftharpoons$ $3C(g)$, the expression for equilibrium constant $K$ is
→(image) $\xrightarrow{\Delta }X;X$ can also be formed by
→If the potential energy of the electron is $-10\,eV$ what is total energy? ................ $\mathrm{eV}$
→Benzene reacts with $n-$ propyl chloride in the presence of anhydrous $AlCl_3$ to give predominantly :
→Which of the following reaction can be used to define the heat of formation of $C{O_2}(g)$
→What is the correct mode of hybridization of the central atom in the following compounds : $NO_2^ + ,S{F_{4,}}P{F_6}^ - $
→Minimum de-Broglie wavelength is associated with
The values of dissociation constants of some acids (at ${25\,^o}C$) are as follows. Indicate which is the strongest acid in water
→