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Which among these is not a structural isomer of the compound C4H8?
- a)But-1-ene
- b)But-2-ene
- c)But-3-ene
- d)2-methylpropene
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Which among these is not a structural isomer of the compound C4H8?a)Bu...
The answer is c. But-3-ene. But-3-ene is not a structural isomer of C4H8 because it is the same molecule as But-1-ene, just numbered differently. The structural isomers of C4H8 are But-1-ene, But-2-ene, and 2-methylpropene. But-1-ene and But-2-ene are position isomers, differing in the position of the double bond. 2-methylpropene is a branched isomer. But-3-ene is not a distinct isomer because the numbering of the carbon chain starts from the end closest to the double bond, making it identical to But-1-ene.
Community Answer
Which among these is not a structural isomer of the compound C4H8?a)Bu...
Understanding Structural Isomers of C4H8
Structural isomers are compounds that have the same molecular formula but differ in the connectivity of their atoms. The molecular formula C4H8 indicates that there are multiple possible structural isomers.
Options Analysis
- a) But-1-ene
- This compound is a straight-chain alkene with a double bond between the first and second carbon atoms.
- b) But-2-ene
- This is another straight-chain alkene but with the double bond between the second and third carbon atoms. It exists in two forms: cis and trans.
- c) But-3-ene
- This compound is not valid as it implies a double bond between the third and fourth carbon atoms in a four-carbon chain, which cannot exist. The maximum number of carbon atoms for such positioning does not allow for a third double bond without breaking the chain.
- d) 2-methylpropene
- This compound is a branched alkene, featuring a double bond and a branching methyl group attached to the second carbon.
Conclusion
The correct answer is option 'C' (But-3-ene) because it does not represent a valid structural isomer of C4H8. The possible positions for a double bond in a four-carbon chain can only occur between the first and second or the second and third carbon atoms, making But-3-ene an impossible structure. Thus, only But-1-ene, But-2-ene, and 2-methylpropene are valid structural isomers.
Structural isomers are compounds that have the same molecular formula but differ in the connectivity of their atoms. The molecular formula C4H8 indicates that there are multiple possible structural isomers.
Options Analysis
- a) But-1-ene
- This compound is a straight-chain alkene with a double bond between the first and second carbon atoms.
- b) But-2-ene
- This is another straight-chain alkene but with the double bond between the second and third carbon atoms. It exists in two forms: cis and trans.
- c) But-3-ene
- This compound is not valid as it implies a double bond between the third and fourth carbon atoms in a four-carbon chain, which cannot exist. The maximum number of carbon atoms for such positioning does not allow for a third double bond without breaking the chain.
- d) 2-methylpropene
- This compound is a branched alkene, featuring a double bond and a branching methyl group attached to the second carbon.
Conclusion
The correct answer is option 'C' (But-3-ene) because it does not represent a valid structural isomer of C4H8. The possible positions for a double bond in a four-carbon chain can only occur between the first and second or the second and third carbon atoms, making But-3-ene an impossible structure. Thus, only But-1-ene, But-2-ene, and 2-methylpropene are valid structural isomers.
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Which among these is not a structural isomer of the compound C4H8?a)But-1-eneb)But-2-enec)But-3-ened)2-methylpropeneCorrect answer is option 'C'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which among these is not a structural isomer of the compound C4H8?a)But-1-eneb)But-2-enec)But-3-ened)2-methylpropeneCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which among these is not a structural isomer of the compound C4H8?a)But-1-eneb)But-2-enec)But-3-ened)2-methylpropeneCorrect answer is option 'C'. Can you explain this answer?.
Which among these is not a structural isomer of the compound C4H8?a)But-1-eneb)But-2-enec)But-3-ened)2-methylpropeneCorrect answer is option 'C'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which among these is not a structural isomer of the compound C4H8?a)But-1-eneb)But-2-enec)But-3-ened)2-methylpropeneCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which among these is not a structural isomer of the compound C4H8?a)But-1-eneb)But-2-enec)But-3-ened)2-methylpropeneCorrect answer is option 'C'. Can you explain this answer?.
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