Consider the hypothetical molecule B-A=B. Are the following statements true or false? (a) This molecule cannot exist. (b) If resonance was important, the molecule would have identical A–B bond lengths.

Video transcript

Hi everyone here we have a question telling us to consider the linear tetra iodide ion and ion I for negative, identify the following statements about this ion as true or false. A This ion does not exist in reality this is true. The molecular orbital Diagram shows that there are 16 bonding and 13 anti bonding electrons. The bonding order will be B O, equals 16 minus 13, Divided by two equals 1.5. And if we look at the lewis structure, we have iodine With three lone pairs connected to another iodine With three lone pairs connected to another iodine With three lone pairs connected to another iodine With three lone pairs. We see that a bond order of 1.5 is too small to hold this large molecule due to the low bond order. This molecule is too unstable to exist. Next we have be, If it were to exist in reality it would be a radical ion. iodine has seven valence electrons, I equals seven times Equals 28 electrons. One electron for the negative charge equals 29 electrons. Since the total number of electrons is odd, it will be radical. So B is true. So our final answers are true and true. Thank you for watching. Bye