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  3. 11th Class
  4. Chemistry
  5. Organic Chemistry: Some Basic Principles & Techniques / कार्बनिक रसायन : कुछ मूलभूत सिद्धांत एवं तकन

11th Class Chemistry Organic Chemistry: Some Basic Principles & Techniques / कार्बनिक रसायन : कुछ मूलभूत सिद्धांत एवं तकन

  • question_answer 66)
    Which of the following is the correct IUPAC name? (a) 3-Ethyl-4, 4-dimethylheptane                              (b) 4, 4-Dimethyl-3-ethylheptane (c) 5-Ethyl-4, 4-dimethylheptane                              (d) 4, 4-Bis (methyl)-3-ethylheptane

    Answer:

    (a) While deciding the alphabetical order of substituents, numerical prefixes such as di-, tri-, etc., are not considered. Now, since 'e' of ethyl comes before ?m? of dimethyl therefore, lower locant 3 is given to ethyl.


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