Paper: CSIR-NET June 2021 · Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Marks: 2 · Difficulty: Easy
Which of the statements (A-D) given below are correct for $\mathrm{B_2H_6}$ molecule:A. Addition of $\mathrm{Et_2O.BF_3}$ to $\mathrm{NaBH_4}$ in a polyether solvent produces $\mathrm{B_2H_6}$.B. It has $\mathrm{D_{2d}}$ symmetry.C. Reaction of $\mathrm{B_2H_6}$ with $\mathrm{NMe_3}$ give $\mathrm{Me_3N.BH_3}$.D. It is diamagnetic.
(a)A, B and C
(b)A, C and D
(c)A and B only
(d)B and D only
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
NaBH₄ + Et₂O·BF₃ in polyether gives B₂H₆. NMe₃ cleaves it symmetrically to Me₃N·BH₃, and diborane is diamagnetic. Its symmetry is D₂h, not D₂d. A, C and D (b).