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For nomenclature of alkenes in the IUPAC system, the longest chain of carbon atoms containing the double bond is selected. Numbering of the chain is done from the end which is nearer to the double bond. The suffix ‘ene’ replaces ‘ane’ of alkanes. The first member of the alkene series is: CH2 (replacing n by 1 in CnH2n) known as methene but has a very short life. The first stable member of the alkene series is C2H4 known as ethylene (common) or ethene (IUPAC).
Q. The IUPAC name of CH3—CH=CH—CH3 is:
- a)Propene
- b)But-1-ene
- c)But-2-ene
- d)Buta-1, 3-diene
Correct answer is option 'C'. Can you explain this answer?
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**Explanation:**
The given compound is CH3—CH=CH—CH3, which contains four carbon atoms.
To name the compound using the IUPAC system, we follow these steps:
1. Select the longest chain containing the double bond. In this case, we have a chain of four carbon atoms.
2. Number the carbon atoms in the chain starting from the end nearest to the double bond. In this case, we start numbering from the left end.
3. Assign a locator number to the double bond. In this case, the double bond is between the second and third carbon atoms.
4. Name the compound by replacing the 'ane' ending of the corresponding alkane with 'ene'.
Now, let's apply these rules to name the given compound:
1. The longest chain containing the double bond has four carbon atoms.
2. Numbering the carbon atoms from the left end, we have:
- The double bond is between the second and third carbon atoms.
- The first carbon atom is attached to three hydrogen atoms (CH3).
- The fourth carbon atom is attached to three hydrogen atoms (CH3).
3. The locator number for the double bond is 2.
4. The corresponding alkane for the given compound is butane (C4H10). By replacing the 'ane' ending with 'ene' and adding the locator number, the IUPAC name of the compound is but-2-ene.
Therefore, the correct IUPAC name for CH3—CH=CH—CH3 is **but-2-ene** (option C).
The given compound is CH3—CH=CH—CH3, which contains four carbon atoms.
To name the compound using the IUPAC system, we follow these steps:
1. Select the longest chain containing the double bond. In this case, we have a chain of four carbon atoms.
2. Number the carbon atoms in the chain starting from the end nearest to the double bond. In this case, we start numbering from the left end.
3. Assign a locator number to the double bond. In this case, the double bond is between the second and third carbon atoms.
4. Name the compound by replacing the 'ane' ending of the corresponding alkane with 'ene'.
Now, let's apply these rules to name the given compound:
1. The longest chain containing the double bond has four carbon atoms.
2. Numbering the carbon atoms from the left end, we have:
- The double bond is between the second and third carbon atoms.
- The first carbon atom is attached to three hydrogen atoms (CH3).
- The fourth carbon atom is attached to three hydrogen atoms (CH3).
3. The locator number for the double bond is 2.
4. The corresponding alkane for the given compound is butane (C4H10). By replacing the 'ane' ending with 'ene' and adding the locator number, the IUPAC name of the compound is but-2-ene.
Therefore, the correct IUPAC name for CH3—CH=CH—CH3 is **but-2-ene** (option C).
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For nomenclature of alkenes in the IUPAC system, the longest chain of carbon atoms containing the double bond is selected. Numbering of the chain is done from the end which is nearer to the double bond. The suffix ‘ene’ replaces ‘ane’ of alkanes. The first member of the alkene series is: CH2 (replacing n by 1 in CnH2n) known as methene but has a very short life. The first stable member of the alkene series is C2H4 known as ethylene (common) or ethene (IUPAC).Q. The IUPAC name of CH3—CH=CH—CH3 is:a)Propeneb)But-1-enec)But-2-ened)Buta-1, 3-dieneCorrect answer is option 'C'. Can you explain this answer?
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For nomenclature of alkenes in the IUPAC system, the longest chain of carbon atoms containing the double bond is selected. Numbering of the chain is done from the end which is nearer to the double bond. The suffix ‘ene’ replaces ‘ane’ of alkanes. The first member of the alkene series is: CH2 (replacing n by 1 in CnH2n) known as methene but has a very short life. The first stable member of the alkene series is C2H4 known as ethylene (common) or ethene (IUPAC).Q. The IUPAC name of CH3—CH=CH—CH3 is:a)Propeneb)But-1-enec)But-2-ened)Buta-1, 3-dieneCorrect answer is option 'C'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about For nomenclature of alkenes in the IUPAC system, the longest chain of carbon atoms containing the double bond is selected. Numbering of the chain is done from the end which is nearer to the double bond. The suffix ‘ene’ replaces ‘ane’ of alkanes. The first member of the alkene series is: CH2 (replacing n by 1 in CnH2n) known as methene but has a very short life. The first stable member of the alkene series is C2H4 known as ethylene (common) or ethene (IUPAC).Q. The IUPAC name of CH3—CH=CH—CH3 is:a)Propeneb)But-1-enec)But-2-ened)Buta-1, 3-dieneCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for For nomenclature of alkenes in the IUPAC system, the longest chain of carbon atoms containing the double bond is selected. Numbering of the chain is done from the end which is nearer to the double bond. The suffix ‘ene’ replaces ‘ane’ of alkanes. The first member of the alkene series is: CH2 (replacing n by 1 in CnH2n) known as methene but has a very short life. The first stable member of the alkene series is C2H4 known as ethylene (common) or ethene (IUPAC).Q. The IUPAC name of CH3—CH=CH—CH3 is:a)Propeneb)But-1-enec)But-2-ened)Buta-1, 3-dieneCorrect answer is option 'C'. Can you explain this answer?.
For nomenclature of alkenes in the IUPAC system, the longest chain of carbon atoms containing the double bond is selected. Numbering of the chain is done from the end which is nearer to the double bond. The suffix ‘ene’ replaces ‘ane’ of alkanes. The first member of the alkene series is: CH2 (replacing n by 1 in CnH2n) known as methene but has a very short life. The first stable member of the alkene series is C2H4 known as ethylene (common) or ethene (IUPAC).Q. The IUPAC name of CH3—CH=CH—CH3 is:a)Propeneb)But-1-enec)But-2-ened)Buta-1, 3-dieneCorrect answer is option 'C'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about For nomenclature of alkenes in the IUPAC system, the longest chain of carbon atoms containing the double bond is selected. Numbering of the chain is done from the end which is nearer to the double bond. The suffix ‘ene’ replaces ‘ane’ of alkanes. The first member of the alkene series is: CH2 (replacing n by 1 in CnH2n) known as methene but has a very short life. The first stable member of the alkene series is C2H4 known as ethylene (common) or ethene (IUPAC).Q. The IUPAC name of CH3—CH=CH—CH3 is:a)Propeneb)But-1-enec)But-2-ened)Buta-1, 3-dieneCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for For nomenclature of alkenes in the IUPAC system, the longest chain of carbon atoms containing the double bond is selected. Numbering of the chain is done from the end which is nearer to the double bond. The suffix ‘ene’ replaces ‘ane’ of alkanes. The first member of the alkene series is: CH2 (replacing n by 1 in CnH2n) known as methene but has a very short life. The first stable member of the alkene series is C2H4 known as ethylene (common) or ethene (IUPAC).Q. The IUPAC name of CH3—CH=CH—CH3 is:a)Propeneb)But-1-enec)But-2-ened)Buta-1, 3-dieneCorrect answer is option 'C'. Can you explain this answer?.
Solutions for For nomenclature of alkenes in the IUPAC system, the longest chain of carbon atoms containing the double bond is selected. Numbering of the chain is done from the end which is nearer to the double bond. The suffix ‘ene’ replaces ‘ane’ of alkanes. The first member of the alkene series is: CH2 (replacing n by 1 in CnH2n) known as methene but has a very short life. The first stable member of the alkene series is C2H4 known as ethylene (common) or ethene (IUPAC).Q. The IUPAC name of CH3—CH=CH—CH3 is:a)Propeneb)But-1-enec)But-2-ened)Buta-1, 3-dieneCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 11.
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ample number of questions to practice For nomenclature of alkenes in the IUPAC system, the longest chain of carbon atoms containing the double bond is selected. Numbering of the chain is done from the end which is nearer to the double bond. The suffix ‘ene’ replaces ‘ane’ of alkanes. The first member of the alkene series is: CH2 (replacing n by 1 in CnH2n) known as methene but has a very short life. The first stable member of the alkene series is C2H4 known as ethylene (common) or ethene (IUPAC).Q. The IUPAC name of CH3—CH=CH—CH3 is:a)Propeneb)But-1-enec)But-2-ened)Buta-1, 3-dieneCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Class 11 tests.
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