From the molecular orbital perspective, explain what frontier orbitals are involved in the reaction CH3I + Br(-) -> CH3Br + I(-) and why C-I bond will be broken. Comment on the distances observed below and tie them into the explanation.  reaction complex at start distance between C and Br(-): 2.737A, bond length C-I: 2.146A transition state distance between C and Br(-): 2.696A, bond length C-I: 2.577A

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From the molecular orbital perspective, explain what frontier orbitals are involved in the reaction CH3I + Br(-) -> CH3Br + I(-) and why C-I bond will be broken. Comment on the distances observed below and tie them into the explanation. 

reaction complex at start

distance between C and Br(-): 2.737A, bond length C-I: 2.146A

transition state

distance between C and Br(-): 2.696A, bond length C-I: 2.577A

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We need to predict the frontier orbitals that are involved in the reaction CH3I + Br-  CH3Br + I-

Also, why C-I bond will be broken during the reaction.

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