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A: CH(3)CH=CH(2) can undergo cationic po...

A: `CH_(3)CH=CH_(2)` can undergo cationic polymeisation with greater ease than `CH_(2)=CH_(2)`.
R: `CH_(3)-` groups has +I effect.

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark 1.

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark 2.

C

If Assertion is true statement but Reason is false, then mark 3.

D

If both Assertion and Reason are false statements the mark 4.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion (A) and the reason (R) provided. ### Step 1: Understanding the Assertion (A) The assertion states that propene (CH₃CH=CH₂) can undergo cationic polymerization more easily than ethene (CH₂=CH₂). - **Cationic Polymerization**: This is a type of polymerization that involves the formation of a carbocation, which is a positively charged carbon atom. The stability of this carbocation is crucial for the ease of polymerization. ### Step 2: Analyzing Propene and Ethene - **Propene**: The structure of propene is CH₃-CH=CH₂. When propene undergoes cationic polymerization, the carbocation formed has a CH₃ group attached to it. The presence of the CH₃ group can stabilize the positive charge due to its +I (inductive) effect, which means it can donate electron density towards the positively charged carbon. - **Ethene**: The structure of ethene is CH₂=CH₂. When ethene undergoes cationic polymerization, the carbocation formed does not have any alkyl groups attached to it, making it less stable compared to the carbocation formed from propene. ### Step 3: Conclusion on Assertion Since the carbocation formed from propene is more stable due to the +I effect of the CH₃ group, it follows that propene can undergo cationic polymerization more easily than ethene. Therefore, the assertion is **correct**. ### Step 4: Understanding the Reason (R) The reason states that the CH₃ group has a +I effect. - **+I Effect**: The +I effect refers to the electron-donating ability of alkyl groups. The CH₃ group can donate electron density to the adjacent positively charged carbon atom, stabilizing the carbocation formed during the polymerization process. ### Step 5: Conclusion on Reason The reason is also **correct** because it accurately explains why the assertion is true. The presence of the CH₃ group in propene provides stabilization to the carbocation formed during cationic polymerization. ### Final Conclusion Both the assertion and the reason are correct, and the reason is the correct explanation of the assertion. ### Answer: Both A and R are correct, and R is the correct explanation of A. ---
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Knowledge Check

  • CH_(3)CH_(2)-OH can be converted to CH_(3)CH_(2)CN by the following reactions :

    A
    `CH_(3)CH_(2)OH+KCNoverset(Delta)to`
    B
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    D
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