Q63 · CSIR-NET Chemistry, December 2013
Paper: CSIR-NET December 2013 · Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Marks: 2 · Difficulty: Easy
The orbital interactions shown below represent 
(a)CH-Al interactions in $\mathrm{Al}_{2}\left(\mathrm{CH}_{3}\right)_{6}$
(b)B-H interactions in $\mathrm{B}_{2} \mathrm{H}_{6}$
(c)CH-Li interaction in $\mathrm{Li}_{4}\left(\mathrm{CH}_{3}\right)_{4}$
(d)$\mathrm{CH_3CH_2}$-Mg interactions in $\mathrm{EtMgBr \cdot (OEt_2)_2}$
Answer
Answer: C ✓ checked by 4AB · confidence medium
Explanation
The picture shows a methyl sp³ lobe interacting with s orbitals of three Li atoms, the multicentre bonding of the Li₄ tetrahedron in (LiCH₃)₄. The chapter key also gives (c).
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