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Calculate the I-I distance in each of th...

Calculate the I-I distance in each of the three isomeric diiodobenzenes Assume that the ring is a regular hexagon and that each `C-I` bonds lies on a line through the centre of the hexagon .
Given `C -I` bond length ` =210` pm
The distance between two adjacent C-atom (i.e C-C)
`=140` pm
.

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The distance from the centre of the hexagon to any corner to two adjacent apics form an equilateral triangle
(a )The distance from the centre of the hexagon to an I atom ` =OC + CI = ( 140 + 210) = 350` pm
(b) Half the I-I disatnce is `sqrt3/2` (350 pm)
Therefore I-I disatnce ` =sqrt3` (350 pm)
606 pm
I-I disatnce =2 (350 pm) = 700 pm

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