Question

Among the following pairs, those in which both species have similar structures (isostructural) are:

• A. \(N_3^-,\ XeF_2\)
• B. \([ICl_4]^-,\ [NiCl_4]^{2-}\)
• C. \([ClF_2]^+,\ [ICl_4]^-\)
• D. \(XeO_3,\ SO_3\)

Hint:

Compare the VSEPR shapes (hybridisation and lone pairs) of each species in the four pairs.

Answer 1

The Correct Option is A

Step 1: N3- is linear (steric number 2, no lone pair).

Step 2: XeF2 (steric number 5, 3 lone pairs equatorial) is also linear.

Step 3: Both are linear triatomics, isostructural.

Step 4: [ICl4]- is square planar, [NiCl4]2- is tetrahedral - mismatch.

Step 5: [ClF2]+ is bent, [ICl4]- is square planar - mismatch.

Step 6: XeO3 is pyramidal, SO3 is trigonal planar - mismatch.

\[\boxed{(A)\ N_3^-,\ XeF_2}\]