Selected molecular orbitals (MOs) of 1,3-butadiene and ethylene are shown below.

Question

Selected molecular orbitals (MOs) of 1,3-butadiene and ethylene are shown below. For each combination given determine whether the cycloaddition reaction between these molecular orbitals is symmetry-allowed or symmetry-forbidden.

Gradebook O 2/15/2017 11:55 PM A 86.6/100 2/15/2017 11:18 AM Print Calculator Periodic Table Question 25 of 25 Mapoeb A Sapling Learning macmillan laamino Selected molecular orbitals (MOs) of 1,3-butadiene and ethylene are shown below. For each combination given determine whether the cycloaddition reaction between these molecular orbitals is symmetry-allowed or symmetry-forbidden 1,3-butadiene (tz) (nz) ethylene ethylene (t) (n) O B is allowed but A is forbidden O both A and Bare allowed O both A and Bare forbidden O A is allowed but Bis forbidden AO Previous Give Up & View Solution Check Answer Next Exit Hint

Explanation / Answer

A is allowed but B is forbidden.

for cycloaddition reaction orbitals of same phase is allowed to overlap. and opposite phase is forbidden.

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