Concept explainers
12-27 Explain why each name is incorrect and then write a correct name.
- 2-Ethyl-l-propene
- 5-lsopropylcyclohexene
- 4-Methyl-4-hexene
- 2-sec-Butyl-l-butene
- 6,6-Dimethylcyclohexene
- 2-Ethyl-2-hexene
(a)
Interpretation:
To identify the error in name of the given compound and write the correct IUPAC names.
Concept Introduction:
The rules to write the IUPAC names are as follows-
- The longest carbon chain is identified, and the root name is given accordingly.
- All the substituents attached to the root chain are determined.
- The position of the substituents is so assigned that the sum of their positions comes to be the least of all possible positions.
- The prefix di, tri, tetra is used if the same substituent is present two, three and four times respectively.
- All the substituents in the name are written in alphabetical order.
- For a cyclic hydrocarbon the prefix cyclo- is used.
Answer to Problem 12.27P
2-Methyl-but-1-ene.
Explanation of Solution
2-Ethyl-1-propene.
Error- longest chain not correctly located.
Correct name-
2-Methyl-but-1-ene.
(b)
Interpretation:
To identify the error in name of the given compound and write the correct IUPAC names.
Concept Introduction:
The rules to write the IUPAC names are as follows-
- The longest carbon chain is identified, and the root name is given accordingly.
- All the substituents attached to the root chain are determined.
- The position of the substituents is so assigned that the sum of their positions comes to be the least of all possible positions.
- The prefix di, tri, tetra is used if the same substituent is present two, three and four times respectively.
- All the substituents in the name are written in alphabetical order.
- For a cyclic hydrocarbon the prefix cyclo- is used.
Answer to Problem 12.27P
4-Isopropylcyclohexene.
Explanation of Solution
5-Isopropylcyclohexene.
Error- position of the substituent not correctly mentioned.
Correct name-
4-Isopropylcyclohexene.
(c)
Interpretation:
To identify the error in name of the given compound and write the correct IUPAC names.
Concept Introduction:
The rules to write the IUPAC names are as follows-
- The longest carbon chain is identified, and the root name is given accordingly.
- All the substituents attached to the root chain are determined.
- The position of the substituents is so assigned that the sum of their positions comes to be the least of all possible positions.
- The prefix di, tri, tetra is used if the same substituent is present two, three and four times respectively.
- All the substituents in the name are written in alphabetical order.
- For a cyclic hydrocarbon the prefix cyclo- is used.
Answer to Problem 12.27P
3-Methyl-2-hexene.
Explanation of Solution
4-Methyl-4-hexene.
Error- position of the double bond not correctly mentioned.
Correct name-
3-Methyl-2-hexene.
(d)
Interpretation:
To identify the error in name of the given compound and write the correct IUPAC names.
Concept Introduction:
The rules to write the IUPAC names are as follows-
- The longest carbon chain is identified, and the root name is given accordingly.
- All the substituents attached to the root chain are determined.
- The position of the substituents is so assigned that the sum of their positions comes to be the least of all possible positions.
- The prefix di, tri, tetra is used if the same substituent is present two, three and four times respectively.
- All the substituents in the name are written in alphabetical order.
- For a cyclic hydrocarbon the prefix cyclo- is used.
Answer to Problem 12.27P
2-Ethyl-3-methyl -1-pentene.
Explanation of Solution
2-sec-butyl-1-butene.
Error- longest chain not correctly determined.
Correct name-
2-Ethyl-3-methyl -1-pentene.
(e)
Interpretation:
To identify the error in name of the given compound and write the correct IUPAC names.
Concept Introduction:
The rules to write the IUPAC names are as follows-
- The longest carbon chain is identified, and the root name is given accordingly.
- All the substituents attached to the root chain are determined.
- The position of the substituents is so assigned that the sum of their positions comes to be the least of all possible positions.
- The prefix di, tri, tetra is used if the same substituent is present two, three and four times respectively.
- All the substituents in the name are written in alphabetical order.
- For a cyclic hydrocarbon the prefix cyclo- is used.
Answer to Problem 12.27P
3,3-Dimethylcyclohexene.
Explanation of Solution
6,6-Dimethylcyclohexene.
Error- position of substituents not correctly determined.
Correct name-
3,3-Dimethylcyclohexene.
(f)
Interpretation:
To identify the error in name of the given compound and write the correct IUPAC names.
Concept Introduction:
The rules to write the IUPAC names are as follows-
- The longest carbon chain is identified, and the root name is given accordingly.
- All the substituents attached to the root chain are determined.
- The position of the substituents is so assigned that the sum of their positions comes to be the least of all possible positions.
- The prefix di, tri, tetra is used if the same substituent is present two, three and four times respectively.
- All the substituents in the name are written in alphabetical order.
- For a cyclic hydrocarbon the prefix cyclo- is used.
Answer to Problem 12.27P
3-Methyl-3-Heptene.
Explanation of Solution
2-Ethyl-2-hexene.
Error- longest chain not correctly determined.
Correct name-
3-Methyl-3-Heptene.
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