31. Which mechanism is correct for the following intramolecular substitution reaction? (a) (b) (c) H N: H H₂N. OH H. H N: CI NaOH jeze OH *-= NH H H — NH NH OH NH

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**Question 31:**

**Which mechanism is correct for the following intramolecular substitution reaction?**

**Reaction:**

\[ \text{H}_2\text{N}(CH_2)_5\text{Cl} \], when treated with \(\text{NaOH}\), forms a cyclic amine.

**Mechanism Options:**

**(a) Mechanism:**

1. The hydroxide ion (\( \text{OH}^- \)) deprotonates the amine group.
2. The deprotonated nitrogen attacks the carbon with the chlorine, resulting in the formation of a six-membered ring and the expulsion of chloride ion.

**(b) Mechanism:**

1. The formation of a protonated nitrogen intermediate.
2. Cyclization occurs through the positively charged nitrogen, forming a cyclic ammonium ion.
3. The hydroxide ion (\( \text{OH}^- \)) deprotonates the nitrogen to produce the final cyclic amine.

**(c) Mechanism:**

1. The intramolecular nucleophilic substitution occurs directly, forming a cyclic ammonium ion.
2. The hydroxide ion (\( \text{OH}^- \)) deprotonates the cyclic ammonium ion to yield the cyclic amine.

_The problem provides three possible mechanisms for converting a linear compound to a cyclic amine via intramolecular substitution, involving the deprotonation and cyclization steps._
Transcribed Image Text:**Question 31:** **Which mechanism is correct for the following intramolecular substitution reaction?** **Reaction:** \[ \text{H}_2\text{N}(CH_2)_5\text{Cl} \], when treated with \(\text{NaOH}\), forms a cyclic amine. **Mechanism Options:** **(a) Mechanism:** 1. The hydroxide ion (\( \text{OH}^- \)) deprotonates the amine group. 2. The deprotonated nitrogen attacks the carbon with the chlorine, resulting in the formation of a six-membered ring and the expulsion of chloride ion. **(b) Mechanism:** 1. The formation of a protonated nitrogen intermediate. 2. Cyclization occurs through the positively charged nitrogen, forming a cyclic ammonium ion. 3. The hydroxide ion (\( \text{OH}^- \)) deprotonates the nitrogen to produce the final cyclic amine. **(c) Mechanism:** 1. The intramolecular nucleophilic substitution occurs directly, forming a cyclic ammonium ion. 2. The hydroxide ion (\( \text{OH}^- \)) deprotonates the cyclic ammonium ion to yield the cyclic amine. _The problem provides three possible mechanisms for converting a linear compound to a cyclic amine via intramolecular substitution, involving the deprotonation and cyclization steps._
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