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Chapter 16: Q2P (page 742)

Why are numbers not used to designate the position of the functional group in propanone and butanedione?

Short Answer

Expert verified

If the position of carbonyl group changes, then it would not be considered as a ketone.

Step by step solution

01

Step-by-step-solutionStep 1: Ketones

Ketones come under the category of carbonyl compounds. The IUPAC name of the ketones is acquired by replacing 鈥榚鈥� on the end of the parent hydrocarbon with 鈥渙ne鈥�. Some examples of ketone are 2-propanone and 2-methyl-2-butanone.

02

Reason for not using numbers to designate the position of functional groups in propanone and butanedione

The structure of propanone and butanedione can be given as:

Structure of the compounds

The numbers are not used to designate the functional group position in propanone and butanedione as if the position of the carbonyl group changes, then that compound will not be a ketone.

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Most popular questions from this chapter

What is the product of each of the following reactions?

Question: The only organic compound obtained when compound Z undergoes the following sequence of reactions gives the 1H NMR spectrum shown.

Identify compound Z.

A compound gives the following IR spectrum. Upon reaction with sodium borohydride followed by acidification, it forms the product with the H1NMR spectrum shown below. Identify the starting material and the product.

Question:Show how each of the following compounds could be prepared from the given starting material. Each requires a protecting group.

a. Show how the following compounds can be prepared, using ethyne as one of the starting materials:

  1. 1-pentyn-3-ol
  2. 1-phenyl-2-butyn-1-ol
  3. 2-methyl-3-hexyn-2-ol

b. Explain why ethyne should be alkylated before, rather than after, nucelophilic addition.
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