Question

A molecule with an even number of -bonds will undergo what type of electrocyclic reaction : (a) Conrotatory, thermal (b) Conrotatory, photochemical (c) Disrotatory, thermal (d) Disrotatory, photochemica​

Answer 1

Answer:

electrocyclic reaction is those reactions in which a ring is formed with the generation of new σ bond and the loss of a π bond, in other words, a reaction in which a ring is closed or opened at the expense of a conjugated double bond or triple bond.

Explanation:

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Answer 2

A molecule with an even number of pi-bonds will undergo what type of electrocyclic reaction : (a) Conrotatory, thermal (b) Conrotatory, photochemical (c) Disrotatory, thermal (d) Disrotatory, photochemical​

A molecule with an even number of pi-bonds will undergo a Conrotatary, thermal, and disrotatory photochemical electrocyclic reaction. (option a and d)

• In an electrocyclic reaction, one pi bond gets converted to one sigma bond and vice versa.
• It is a pericyclic rearrangement.
• When a molecule has an even number of pi-bonds, then that molecule will undergo either conrotatory in thermal induce state (ground state) or disrotatory in photochemically induced state (excited state).
• Thus both the a and d options are correct.
• In the case of odd pi-electrons opposite happens.

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