Use the drop-down menus to classify each of the following as an addition, substitution, elimination, or condensation reaction.

1. [tex] CH_3CHO + H_2O \rightarrow CH_3OCH_3 [/tex]
[tex]$\square$[/tex] Addition
[tex]$\square$[/tex] Substitution
[tex]$\square$[/tex] Elimination
[tex]$\square$[/tex] Condensation

2. [tex] CH_2ClCH_2Cl + Zn \rightarrow C_2H_4 + ZnCl_2 [/tex]
[tex]$\square$[/tex] Addition
[tex]$\square$[/tex] Substitution
[tex]$\square$[/tex] Elimination
[tex]$\square$[/tex] Condensation

3. [tex] CH_3CH_2Br + OH^- \rightarrow CH_3CH_2OH + Br^- [/tex]
[tex]$\square$[/tex] Addition
[tex]$\square$[/tex] Substitution
[tex]$\square$[/tex] Elimination
[tex]$\square$[/tex] Condensation

4. [tex] 2 CH_3COOH \rightarrow (CH_3CO)_2O + H_2O [/tex]
[tex]$\square$[/tex] Addition
[tex]$\square$[/tex] Substitution
[tex]$\square$[/tex] Elimination
[tex]$\square$[/tex] Condensation



Answer :

Let's classify each reaction step-by-step:

1. For the reaction:
[tex]\[ CH_3CHO + H_2O \rightarrow CH_3OCH_3 \][/tex]
In this reaction, two molecules (CH_3CHO and H_2O) combine to form one product (CH_3OCH_3). This type of reaction where two or more molecules combine to form a single product is known as an addition reaction.

Classify as: addition

2. For the reaction:
[tex]\[ CH_2ClCH_2Cl + Zn \rightarrow C_2H_4 + ZnCl_2 \][/tex]
Here, a molecule (CH_2ClCH_2Cl) loses atoms or groups (in this case, chlorine atoms) with the assistance of Zn to form a simpler molecule (C_2H_4). Such a reaction where a single molecule splits into two simpler products is called an elimination reaction.

Classify as: elimination

3. For the reaction:
[tex]\[ CH_3CH_3Br + OH^- \rightarrow CH_3CH_3OH + Br^- \][/tex]
In this reaction, a bromine atom from CH_3CH_3Br is replaced by a hydroxyl group (OH^-) to form CH_3CH_3OH and Br^-. This type of reaction where one atom or a group of atoms is replaced by another atom or group is known as a substitution reaction.

Classify as: substitution

4. For the reaction:
[tex]\[ 2 CH_3COOH \rightarrow (CH_3CO)_2O + H_2O \][/tex]
Here, two molecules of acetic acid (CH_3COOH) combine to form acetic anhydride ((CH_3CO)_2O) and water (H_2O). This type of reaction, where two molecules combine to form a larger molecule with the release of a small molecule like water, is called a condensation reaction.

Classify as: condensation

Thus, the classifications are:

[tex]\[ \begin{align*} \boxed{\text{addition}}, & \quad CH_3CHO + H_2O \rightarrow CH_3OCH_3 \\ \boxed{\text{elimination}}, & \quad CH_2ClCH_2Cl + Zn \rightarrow C_2H_4 + ZnCl_2 \\ \boxed{\text{substitution}}, & \quad CH_3CH_3Br + OH^- \rightarrow CH_3CH_3OH + Br^- \\ \boxed{\text{condensation}}, & \quad 2 CH_3COOH \rightarrow (CH_3CO)_2O + H_2O \\ \end{align*} \][/tex]