A mixture of 0.1 mole of (2E,4E)-2,4-hexadiene and 0.1 mole of (2E,4Z)-2,4-hexadiene was allowed to react with

Question:

A mixture of 0.1 mole of (2E,4E)-2,4-hexadiene and 0.1 mole of (2E,4Z)-2,4-hexadiene was allowed to react with 0.1 mole of TCNE. After the reaction, the unreacted diene was found to consist of only one of the starting 2,4-hexadiene isomers. Which isomer did not react? Explain.

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