2. Br₂ a Proton transfer b= Lewis acid/base c = Radical chain substitution 1. 2. CH₂OH conc. HBr OCH₂ Br OH d = Radical chain addition e = Electrophilic addition f=E1 Elimination HBr Br Identify the mechanism by which each of the reactions above proceeds from among the mechanisms listed. Use the letters a - i for your answers. = E2 Elimination h = SN1 Nucleophilic substitution i = SN2 Nucleophilic substitution

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### Reaction Mechanisms Identification

This exercise involves analyzing two chemical reactions and identifying their mechanisms from the options provided. Below are the reaction equations and the list of possible mechanisms.

#### Reaction 1:

\[ \text{Isobutane (CH}_3)_2\text{CH}_2 + \text{Br}_2 \rightarrow \text{(CH}_3)_2\text{CBrOCH}_3 + \text{HBr} \]

This reaction involves the conversion of isobutane with bromine to form a bromomethane compound and hydrobromic acid.

#### Reaction 2:

\[ \text{2-Methylbut-2-ene} + \text{conc. HBr} \rightarrow \text{2-Methylbutan-2-ol} + \text{t-Butyl bromide} \]

This reaction involves treating 2-methylbut-2-ene with concentrated hydrobromic acid to form 2-methylbutan-2-ol and t-butyl bromide.

### Possible Mechanisms:

- **a** = Proton transfer
- **b** = Lewis acid/base
- **c** = Radical chain substitution
- **d** = Radical chain addition
- **e** = Electrophilic addition
- **f** = E1 Elimination
- **g** = E2 Elimination
- **h** = S<sub>N</sub>1 Nucleophilic substitution
- **i** = S<sub>N</sub>2 Nucleophilic substitution

### Instructions

Identify the mechanism by which each of the reactions above proceeds. Use the letters (a - i) for your answers.

**1.** [ ]

**2.** [ ]

### Explanation

- **Reaction 1** likely proceeds through a radical substitution mechanism (option c), as it involves halogenation of an alkane with bromine, typical for radical chain reactions.
  
- **Reaction 2** could proceed through an electrophilic addition mechanism (option e), as it involves addition of HBr to an alkene.

Please write your answers in the boxes provided.
Transcribed Image Text:### Reaction Mechanisms Identification This exercise involves analyzing two chemical reactions and identifying their mechanisms from the options provided. Below are the reaction equations and the list of possible mechanisms. #### Reaction 1: \[ \text{Isobutane (CH}_3)_2\text{CH}_2 + \text{Br}_2 \rightarrow \text{(CH}_3)_2\text{CBrOCH}_3 + \text{HBr} \] This reaction involves the conversion of isobutane with bromine to form a bromomethane compound and hydrobromic acid. #### Reaction 2: \[ \text{2-Methylbut-2-ene} + \text{conc. HBr} \rightarrow \text{2-Methylbutan-2-ol} + \text{t-Butyl bromide} \] This reaction involves treating 2-methylbut-2-ene with concentrated hydrobromic acid to form 2-methylbutan-2-ol and t-butyl bromide. ### Possible Mechanisms: - **a** = Proton transfer - **b** = Lewis acid/base - **c** = Radical chain substitution - **d** = Radical chain addition - **e** = Electrophilic addition - **f** = E1 Elimination - **g** = E2 Elimination - **h** = S<sub>N</sub>1 Nucleophilic substitution - **i** = S<sub>N</sub>2 Nucleophilic substitution ### Instructions Identify the mechanism by which each of the reactions above proceeds. Use the letters (a - i) for your answers. **1.** [ ] **2.** [ ] ### Explanation - **Reaction 1** likely proceeds through a radical substitution mechanism (option c), as it involves halogenation of an alkane with bromine, typical for radical chain reactions. - **Reaction 2** could proceed through an electrophilic addition mechanism (option e), as it involves addition of HBr to an alkene. Please write your answers in the boxes provided.
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