Question

1. Which one has the lowest boiling point and which one has the highest boiling point. Explain.

a. carbon tetrachloride

b. carbon tetrafluoride

c. carbon tetrabromide

d. carbon tetraiodide

2. What is the average bond order for the bonds to the oxygen atoms? (use ClO3-)

My teacher got 2(2/3)+1(1/3)=1.667. I don't understand where did we get these numbers so can you please explain how to get this answer?

Answer 1

highest boiling point is CI4

Since it has the highest mass, greatest intermolecular forces in terms of london dispersion forces, Hence it possess highest boiling point

2 bonds are there with double bond (See the picture down) out of three bonds which is = 2 x 2/3

followed by one bond is present as single bond out of three bonds which is 1x 1/3 .

if you sum up you will get your answer

Other wise you can calculate in the following manner

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