p-Block Elements-I - Result Question 12

####12. Among the following, the correct statement(s) is(are)

(2017 Adv.)

(a) $Al\left(CH _3\right) _3$ has the three-centre two-electron bonds in its dimeric structure

(b) The Lewis acidity of $BCl _3$ is greater than that of $AlCl _3$

(c) $AlCl _3$ has the three-centre two-electron bonds in its dimeric structure

(d) $BH _3$ has the three-centre two-electron bonds in its dimeric structure

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Answer:

Correct Answer: 12. (b, d)

Solution:

  1. (a)

(b) $BCl _3$ is stronger Lewis acid than $AlCl _3$ due to greater extent of $p _{\pi}-p _{\pi}$ back bonding in $AlCl _3$.

(c)

(d)



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