Which of the following pair of molecules contain an odd electron molecule and an expanded octet molecule?

Question

Canvas Classes · Accepted Answer

Odd-electron molecules have an odd total number of valence electrons.
Expanded octet molecules have the central atom with more than 8 electrons.

Step 1 — Check each option:

- (1)  and :  is electron-deficient (not odd-electron);  is expanded octet. But  is NOT odd-electron. ✗

- (2) NO and : NO has 11 valence electrons → odd-electron ✓;  has S with 12 electrons → expanded octet ✓

- (3)  and : Both are expanded octet, neither is odd-electron. ✗

- (4)  and NO:  is electron-deficient; NO is odd

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