Paper: CSIR-NET June 2018 · Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Marks: 2 · Difficulty: Easy
Consider the following statements for $\mathrm{Be_2Cl_4}$ (I), $\mathrm{B_2Cl_4}$ (II) and $\mathrm{Ga_2Cl_4}$ (III):(A) There is an M-M (M = Be, B, Ga) bond in all.(B) The oxidation state of Be, B and Ga is +2.(C) The geometry around the central atom is planar for all.(D) The geometry around the central atom is planar in I and II only.The correct statement(s) is/are
(a)A, B and C
(b)A and B
(c)D only
(d)B, C and D
Answer
Answer: C ✓ checked by 4AB · confidence medium
Explanation
Be₂Cl₄ is Cl-bridged with no Be–Be bond. Ga₂Cl₄ is Ga⁺[GaCl₄]⁻, so Ga is +1/+3, not +2. Only B₂Cl₄ has an M–M bond, and Be₂Cl₄ and B₂Cl₄ are both planar at the central atom. D only (c).