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Question

${\rm{C}}{{\rm{H}}_3}{\rm{C}}{{\rm{H}}_2}{\rm{OH}}\xrightarrow[{{\rm{step}} - 1}]{{{\rm{C}}{{\rm{l}}_2}}}{\rm{C}}{{\rm{H}}_3}{\rm{CHO}}\xrightarrow[{{\rm{step}} - 2}]{{3{\rm{C}}{{\rm{l}}_2}}}{\rm{C}}{{\rm{l}}_3}{\rm{CCHO}}$
In above reactions the role of ${\rm{C}}{{\rm{l}}_2}$ in step-1 and step-2 respectively is

A.RAMA NAGESWARARAO · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
	**Primary Concept**: Oxidation and Chlorination in Organic Chemistry
	**Related Topics**: Redox reactions, halogenation, functional group transformations
	**Prerequisites**: Understanding of oxidation states, basic organic reaction mechanisms
## SOLUTION PATHWAY
**Given Information**:
	* Step 1:  ${m{CH}}_3{m{CH}}_2{m{OH}}$ is converted to ${m{CH}}_3{m{CHO}}$ using ${m{Cl}}_2$
	* Step 2: ${m{CH}}_3{m{CHO}}$ is converted to ${m{CCl}}_3{m{CHO}}$ using ${m{Cl}}_2$
**Method & Steps**:
	1. **Step 1 Analysis:** In the first step, ethanol (${m{CH}}_3{m{CH}}_2{m{OH}}$) is converted to acetaldehyde (${m{CH}}_3{m{CHO}}$). This involves the loss of hydrogen atoms (specifically two H atoms from the carbon bearing the -OH group), which is an oxidation process.  The chlorine acts as an oxidizing agent.
		Reasoning: Oxidation is defined as an increase in oxidation state, which occurs when Hydrogen is removed from an organic molecule.
		Formula/Rule: Oxidation (loss of electrons or gain of oxygen/loss of hydrogen)
	2. **Step 2 Analysis:** In the second step, the three hydrogen atoms on the methyl group of acetaldehyde are replaced by three chlorine atoms. This is a chlorination reaction, specifically a substitution reaction where hydrogen is substituted by chlorine.
		Reasoning:  Chlorination involves the direct addition of chlorine to a molecule, or the substitution of Hydrogen with Chlorine.
		Key Point: While the overall reaction involves chlorine, the key process here is the substitution of hydrogen by chlorine, which is a chlorination reaction.
	3. **Final step:** Based on the analysis, the role of chlorine in step 1 is oxidation and in step 2 is chlorination.
		Result: Oxidation, chlorination
		Verification: The answer matches the definition of oxidation in step one and chlorination in step two
 ## OPTION ANALYSIS
[A] ✓: Step 1 involves the removal of hydrogen atoms, thus oxidation. Step 2 involves the substitution of hydrogen with chlorine, thus chlorination. This is the correct answer.
[B] :x: Step 1 is not reduction, it's oxidation. Step 2 is chlorination.
[C] :x: Step 1 is oxidation, Step 2 is not addition, it's chlorination
[D] :x: Step 1 is oxidation not reduction. Step 2 is chlorination, not substitution in the general sense of a substitution for a functional group, but rather a substitution of hydrogen with chlorine.
 ## LEARNING AIDS
	**Common Mistakes**:
		1. **Confusing Oxidation and Reduction**: Oxidation is the loss of electrons or increase in oxidation state, while reduction is the gain of electrons or decrease in oxidation state. In organic chemistry, oxidation often involves the loss of hydrogen/gain of oxygen and reduction is the gain of hydrogen/loss of oxygen.
		2. **Misidentifying Chlorination**: Chlorination involves the introduction of chlorine atoms into a molecule. It can be addition or substitution.
	**Quick Tips**:
		1. **Oxidation in Organic Chemistry**: Look for changes in the number of bonds to oxygen or loss of hydrogen.
		2. **Chlorination**: Look for the direct incorporation of chlorine into the molecule.

A.RAMA NAGESWARARAO · Answer

The correct Option is "Oxidation, chlorination"

A.RAMA NAGESWARARAO · Answer

Reduction, chlorination

A.RAMA NAGESWARARAO · Answer

Oxidation, addition

A.RAMA NAGESWARARAO · Answer

Reduction, substitution

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