| (I) Decreasing order of atomic radii:\[Tl>In>Al>Ga\] |
| (II) Both \[BC{{l}_{3}}\] and \[AlC{{l}_{3}}\] exists as dimer. |
| (III) In borax, two B-atoms are \[s{{p}^{2}}\]hybridised and two B-atoms are \[s{{p}^{3}}\] hybridised |
| (IV) In diborane \[{{B}_{2}}{{H}_{6}},\] there are two banana bond between \[(B-H-B)\] and both B atoms are \[s{{p}^{2}}\] hybridised. |
A) I, III
B) I, II, III
C) I, III, IV
D) All of the above
Correct Answer: A
Solution :
[a] Statement (I) and (III) are CORRECT. Statement (I) : Exception: \[Al>Ga\]due to poor shielding effect of d-orbital Statement (II): INCORRECT CORRECT statement: \[BC{{l}_{3}}\] exists as monomer whereas \[AlC{{l}_{3}}\] exists as dimer. Statement (IV) INCORRECT: CORRECT statement: Both B atoms are \[s{{p}^{3}}\]hybridised.
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