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
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Answer:
Correct Answer: 12. (b, d)
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)
