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Question: Answered & Verified by Expert
Select the element $(M)$ whose trihalides cannot be hydrolysed to produce an ion of the form $\left[\mathrm{M}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$
Chemistryp Block Elements (Group 13 & 14)JEE Main
Options:
  • A $\mathrm{Al}$
  • B B
  • C Ga
  • D In
Solution:
2093 Upvotes Verified Answer
The correct answer is: B
Boron trihalides cannot be hydrolysed to produce an ion of the form $\left[\mathrm{B}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ because of absence of $d$ orbitals in boron. The maximum covalence of Boron is 4 .

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