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Assertion :But-1-ene2-Methylprop-1-ene a...

Assertion :But-1-ene2-Methylprop-1-ene are position isomers. Reason Position ismoers have same molecular formula but different arrangrment of carbon atoms

A

If both assertion and reason are correct and reason is crect explanation for assertion

B

If both assertion and reason are correct but reason is not cottect explanation for assertion

C

If reason is correct but assertion is incorrect

D

If both assertion and reason are incorrect

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that but-1-ene and 2-methylprop-1-ene are position isomers. - To evaluate this, we need to understand what position isomers are. 2. **Definition of Position Isomers**: - Position isomers are compounds that have the same molecular formula but differ in the position of a functional group or a double bond within the carbon chain. - For example, in alkenes, the position of the double bond can vary. 3. **Analyzing the Structures**: - **But-1-ene** has the structure: CH2=CH-CH2-CH3 (double bond between the first and second carbon). - **2-Methylprop-1-ene** has the structure: CH2=C(CH3)-CH2-CH3 (double bond between the first and second carbon, but with a methyl group on the second carbon). 4. **Comparing the Structures**: - Both compounds have the same molecular formula: C4H8. - However, the position of the double bond is the same in both compounds (between the first and second carbon), which means they are not position isomers. 5. **Understanding the Reason**: - The reason states that position isomers have the same molecular formula but different arrangements of carbon atoms. - This is partially correct, but it is misleading because it does not specify that the difference should be in the position of the functional group or double bond, not just any arrangement of carbon atoms. 6. **Conclusion**: - Since but-1-ene and 2-methylprop-1-ene do not differ in the position of the double bond, they are not position isomers. - Therefore, both the assertion and the reason are incorrect. 7. **Final Answer**: - The correct option is that both the assertion and the reason are incorrect.
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Knowledge Check

  • Assertion : But-1-ene and 2-methylprop-1-ene are position isomers. Reason : Position isomers have same molecular formula but different arrangement of carbon atoms.

    A
    If both assertion and reason are correct and reason is correct explanation for assertion.
    B
    If both assertion and reason are correct but reason is not correct explanation for assertion.
    C
    If assertion is correct but reason is incorrect.
    D
    If both assertion and reason are incorrect.

  • Assertion : But-1-ene amd 2-methylprop-1-ene are position isomers. Reason : Position isomers have same molecular formula but different arrangement of carbon atoms.

    A
    If both assertion and Reason are true, and reason is the true explanation of the assertion.
    B
    If both assertion and reason are true, but reason is not the true explanation of the assertion.
    C
    If assertion is true, but reason is false
    D
    If both assertion and reason are false

  • Assertion (A): Pent -1-ene and 2 -methyl but 1- ene are position isomers Reason (R ): Position isomers have the same molecular formula but differ in the position of functional group.

    A
    If both (A) and (R ) are true and (R ) is the correct explanation for (A).
    B
    If both (A) and (R ) are true and (R ) is not the true explanation for (A)
    C
    If (A) is true, but (R ) is false.
    D
    If (A) is false and (R ) is true.