p-Block Elements-I 1 Question 12
12. Among the following, the correct statement(s) is(are)
(2017 Adv.)
(a) $\mathrm{Al}\left(\mathrm{CH} _{3}\right) _{3}$ has the three-centre two-electron bonds in its dimeric structure
(b) The Lewis acidity of $\mathrm{BCl} _{3}$ is greater than that of $\mathrm{AlCl} _{3}$
(c) $\mathrm{AlCl} _{3}$ has the three-centre two-electron bonds in its dimeric structure
(d) $\mathrm{BH} _{3}$ has the three-centre two-electron bonds in its dimeric structure
Show Answer
Answer:
Correct Answer: 12. (a,b,c)
Solution:
- (a)
(b) $\mathrm{BCl} _{3}$ is stronger Lewis acid than $\mathrm{AlCl} _{3}$ due to greater extent of $p _{\pi}-p _{\pi}$ back bonding in $\mathrm{AlCl} _{3}$.
(c)
(d)
