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Question
Give IUPAC name of the compound given below.
Give IUPAC name of the compound given below.
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Solution
The correct option is D 5−Chlorohexan−2−ol
IUPAC nomenclature of the given compounds
- Given compound is an alcohol.
- For writing IUPAC name of this alcohol, the longest carbon chain i.e., parent chain should be numbered starting from the end that is nearest to −OH.
- Compound is named by replacing the "e" of alkane from which the alcohol is derived with “ol”. The positions of −OH group and substituents are shown by using the numbers of the carbon atoms to which these are attached.
Thus the IUPAC name of the compound will be 5−Chlorohexan−2−ol
Analysing the options
Option (A):
2−Chloro−5−hydroxyhexane is not the correct IUPAC name of the given compound because the carbon atoms of the parent chain are not numbered correctly. Also, alcohol functional group has been treated as substituent despite the presence of chlorine.
Option (B):
2−Hydroxy−5−chlorohexane is not the correct IUPAC name of the given compound because the alcohol functional group has been treated as substituent for naming.
Option (C):
IUPAC name of the given compound is 5−Chlorohexan−2−ol.
Option (D):
2−Chlorohexan−5−ol is not the correct IUPAC name of the given compound because carbon atoms of the parent chain are not numbered correctly.
So, the correct answer is option (C).
IUPAC nomenclature of the given compounds
- Given compound is an alcohol.
- For writing IUPAC name of this alcohol, the longest carbon chain i.e., parent chain should be numbered starting from the end that is nearest to −OH.
- Compound is named by replacing the "e" of alkane from which the alcohol is derived with “ol”. The positions of −OH group and substituents are shown by using the numbers of the carbon atoms to which these are attached.
Thus the IUPAC name of the compound will be 5−Chlorohexan−2−ol
Analysing the options
Option (A):
2−Chloro−5−hydroxyhexane is not the correct IUPAC name of the given compound because the carbon atoms of the parent chain are not numbered correctly. Also, alcohol functional group has been treated as substituent despite the presence of chlorine.
Option (B):
2−Hydroxy−5−chlorohexane is not the correct IUPAC name of the given compound because the alcohol functional group has been treated as substituent for naming.
Option (C):
IUPAC name of the given compound is 5−Chlorohexan−2−ol.
Option (D):
2−Chlorohexan−5−ol is not the correct IUPAC name of the given compound because carbon atoms of the parent chain are not numbered correctly.
So, the correct answer is option (C).
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