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Consider the unknown triatomic molecule XH2. i) Assign the point group for the l

ID: 822549 • Letter: C

Question

Consider the unknown triatomic molecule XH2.

i) Assign the point group for the linear and bent configuration.

ii) Provide a molecular example for each linear and bent configuration.

iii) Construct a MO diagram for the examples stated in part (ii) based on symmetry adapted linear combination (SALC) assuming this molecule is (A) linear and (B) bent.

iv) Use the orbital energy diagram attached to explain the geometric preferences (linear vs bent) for XH2 molecules if the atomic number Z or the central X- atom is varied (Z=4 to 8)






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Explanation / Answer

If a C2v molecule were straightened out into a linear molecule,

its symmetry would turn into D1h, which is the group for

homonuclear diatomic and symmetric triatomic molecules. The

orbital classi