Concept explainers
Explain why each name is incorrect and then write a correct name. Strategy: First draw the structural formula suggested by the incorrect name. Then identify the error, for example, failure to locate the longest chain that contains the
(a) 1-Methylpropene (b) 3-Pentene
(c) 2-Methylcyclohexene (d) 3,3-Dimethylpentene
(e) 4-Hexyne
(f) 2-lsopropyl-2-butene
(a)
Interpretation:
To analyse the error 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 16P
But-2-ene.
Explanation of Solution
1-Methylpropene.
Error- longest chain not correctly located.
Correct name-
But-2-ene.
But-2-ene.
(b)
Interpretation:
To analyse the error 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 16P
2-pentene.
Explanation of Solution
3-Pentene.
Error- Position of double bond not mentioned correctly.
Correct name-
2-Pentene.
(c)
Interpretation:
To analyse the error 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 16P
1-Methylcyclo-1-hexene.
Explanation of Solution
2-Methylcyclohexene.
Error- Position of methyl not correct.
Correct name-
1-Methylcyclo-1-hexene.
(d)
Interpretation:
To analyse the error 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 16P
3,3-Dimethyl-1-pentene.
Explanation of Solution
3,3-Dimethylpentene.
Error-position of double bond not mentioned.
Correct name-
3,3-Dimethyl-1-pentene.
(e)
Interpretation:
To analyse the error 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 16P
2-Hexyne.
Explanation of Solution
4-Hexyne.
Error- position of triple bond is incorrectly mentioned.
Correct name 2-Hexyne.
(f)
Interpretation:
To analyse the error 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 16P
3,4-Dimethyl-2-pentene.
Explanation of Solution
2-Isopropyl-2-butene.
Error- longest chain is not correctly located.
The correct name will be-
3,4-Dimethyl-2-pentene.
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Chapter 12 Solutions
INTRO.TO GENERAL,ORGANIC+BIOCHEM.(LL)
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