Q20 · CSIR-NET Chemistry, December 2013

Paper: CSIR-NET December 2013 · Subject: Organic Chemistry · Chapter: Pericyclic Reactions · Topic: Pericyclic Reactions – General · Marks: 2 · Difficulty: Medium

The number of nodes present in the highest occupied molecular orbital of 1, 3, 5-hexatriene in its ground state is
(a)one
(b)two
(c)three
(d)four
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
1,3,5-Hexatriene has six π MOs; the HOMO in the ground state is ψ₃, which has two nodes (ψₙ has n − 1 nodes).

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