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Which of the following statements is/are wrong about pericyclic reaction ? (a) It is intramolecular cyclisation of acyclic compound. (b) It is intermolecular cyclisation of acyclic compound. (c) It proceeds via concerted mechanism in which breaking and formation of bonds take place simultaneously. (d) It proceed via free-radical mechanism.

A

(a) It is intramolecular cyclisation of acyclic compound.

B

(b) It is intermolecular cyclisation of acyclic compound.

C

(c) It proceeds via coincerted mechanism in which breaking and formation of bonds take place simultaneously.

D

(d) It proceed via free-radical mechanism.

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The correct Answer is:
To determine which statements about pericyclic reactions are incorrect, let's analyze each option step by step. ### Step 1: Understand Pericyclic Reactions Pericyclic reactions are a class of reactions that occur through a concerted mechanism, meaning that bond breaking and bond formation happen simultaneously without the formation of intermediates. They typically involve compounds with conjugated π-bonds and can be initiated by heat or light. ### Step 2: Analyze Each Statement Now, let's evaluate each of the provided statements: **(a) It is intramolecular cyclisation of acyclic compound.** - This statement is **correct**. Pericyclic reactions can involve intramolecular cyclization, where the reaction occurs within a single molecule. **(b) It is intermolecular cyclisation of acyclic compound.** - This statement is **wrong**. Pericyclic reactions typically involve intramolecular processes rather than intermolecular cyclization. **(c) It proceeds via concerted mechanism in which breaking and formation of bonds take place simultaneously.** - This statement is **correct**. Pericyclic reactions are characterized by a concerted mechanism. **(d) It proceeds via free-radical mechanism.** - This statement is **wrong**. Pericyclic reactions do not proceed through free-radical mechanisms; they are concerted and do not involve free radicals. ### Conclusion The incorrect statements about pericyclic reactions are: - **(b)** It is intermolecular cyclisation of acyclic compound. - **(d)** It proceeds via free-radical mechanism. ### Final Answer The wrong statements are **(b)** and **(d)**. ---
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