The Question is from neet-chemistry , and it was created by the author Mr. S M HUSSAIN

Question

Polymerization of alkenes takes place through

Mr. S M HUSSAIN · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
	**Primary Concept**: Polymerization
	**Related Topics**: Alkenes, Addition reactions, Macromolecular Chemistry
	**Prerequisites**: Understanding of chemical bonding, functional groups, and reaction mechanisms.
## SOLUTION PATHWAY
**Given Information**:
	Polymerization of alkenes.
**Method & Steps**:
	1. **Analyze the structure of alkenes:** Alkenes contain a carbon-carbon double bond (C=C). This double bond is reactive and can participate in addition reactions.
		Reasoning: The double bond in alkenes consists of a sigma bond and a pi bond. The pi bond is relatively weaker and can be broken to form new single bonds.
	2. **Understand polymerization:** Polymerization is the process of combining many small molecules (monomers) to form a large molecule (polymer).
		Working: In alkene polymerization, the double bond of each alkene monomer breaks, and the resulting single electrons form new single bonds with adjacent monomer units, creating a long chain.
		Key Point:  No atoms are lost or gained during this process; atoms are simply rearranged.
	3. **Identify the reaction type:** Since the monomers add together without the loss of any atoms, the reaction is an addition reaction.
		Result: Addition reaction.
		Verification: This aligns with the definition of addition reactions where two or more molecules combine to form a larger one without any loss of atoms.
 ## OPTION ANALYSIS
[A] ✓: Addition reaction:  The double bond in alkenes undergoes addition reactions, where the pi bond breaks, and new sigma bonds form with other monomer units, creating a polymer chain. This is the correct mechanism for alkene polymerization.
[B] :x: Substitution reaction: In a substitution reaction, one atom or group is replaced by another. This doesn't happen in polymerization of alkenes.
[C] :x: Condensation reaction: Condensation reactions involve the combination of two molecules with the elimination of a small molecule like water. This is not the case in alkene polymerization.
[D] :x: Elimination reaction: Elimination reactions involve the removal of atoms from a molecule to form a double or triple bond. This is the opposite of what happens during polymerization.
 ## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing addition and condensation polymerization: Remember that addition polymerization involves no loss of atoms, while condensation polymerization involves the loss of a small molecule.
		2. Thinking substitution occurs: Recognize that the double bond is broken and new bonds are formed, not a direct substitution of atoms.
	**Quick Tips**:
		1. Look for the C=C double bond in alkenes as a key indicator for addition polymerization.
		2. Remember 'addition' means adding monomers together without losing any atoms.

Mr. S M HUSSAIN · Answer

The correct Option is "Addition reaction"

Mr. S M HUSSAIN · Answer

Substitution reaction

Mr. S M HUSSAIN · Answer

Condensation reaction

Mr. S M HUSSAIN · Answer

Elimination reaction

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