GF 32 CHENT M4 ASSESSMENT 6
QUESTION 16
Which one is the correct formula for a primary amine?
QUESTION 17
What is the chemical name of the ester compound [tex]$CH _3 CH _2 CH _2 CH _2 COOCH _3$[/tex]?
A. Methyl butanoate
B. Methyl pentanoate
C. Pentyl methanoate
D. Methyl pentanoic acid
QUESTION 18
The IUPAC name for the alcohol [tex]$CH _3 CH ( OH ) CH _2 CH ( CH _3) CH _3$[/tex] is
A. 4-methyl-2-hexanol.
B. 2-methylpentan-4-ol.
C. 4-methylpentan-2-ol.
D. 4-methyl-4-pentanol.
Answer (2)
Primary amines have the general formula R − N H 2 .
The ester C H 3 C H 2 C H 2 C H 2 COOC H 3 is named methyl pentanoate.
The alcohol C H 3 C H ( O H ) C H 2 C H ( C H 3 ) C H 3 is named 4-methylpentan-2-ol.
The answers to the multiple-choice questions are: Question 17: B, Question 18: C. The answer to Question 16 is R − N H 2 . Therefore, the answers are R − N H 2 , B , and C .
Explanation
Introduction We will address each question individually, providing the correct answer and a brief explanation.
Question 16 Analysis Question 16 asks for the correct formula for a primary amine. A primary amine has the general formula R − N H 2 , where R is an alkyl or aryl group. Since the options are not provided, we cannot select a specific answer. However, the general formula is the key.
Question 17 Analysis Question 17 asks for the chemical name of the ester compound C H 3 C H 2 C H 2 C H 2 COOC H 3 . The compound has the structure of an ester, which is formed from an alcohol and a carboxylic acid. In this case, the carboxylic acid part is pentanoic acid ( C H 3 C H 2 C H 2 C H 2 COO H ) and the alcohol part is methanol ( C H 3 O H ). Therefore, the ester is named methyl pentanoate.
Question 18 Analysis Question 18 asks for the IUPAC name for the alcohol C H 3 C H ( O H ) C H 2 C H ( C H 3 ) C H 3 . To name this alcohol, we first identify the longest carbon chain containing the hydroxyl group (OH). The longest chain has 5 carbons, so it's a pentane. The hydroxyl group is on the second carbon, so it's a pentan-2-ol. There is a methyl group ( C H 3 ) on the fourth carbon. Therefore, the IUPAC name is 4-methylpentan-2-ol.
Final Answers Based on the analysis:
Question 16: The correct formula for a primary amine is R − N H 2 .
Question 17: The chemical name of the ester compound C H 3 C H 2 C H 2 C H 2 COOC H 3 is Methyl pentanoate (Option B).
Question 18: The IUPAC name for the alcohol C H 3 C H ( O H ) C H 2 C H ( C H 3 ) C H 3 is 4-methylpentan-2-ol (Option C).
Examples
Understanding the naming and structure of organic compounds like amines, esters, and alcohols is crucial in various fields. For example, in pharmaceuticals, the correct identification and synthesis of these compounds are essential for drug development. Esters are commonly used as flavoring agents in the food industry, and alcohols are used as solvents and disinfectants. Knowing the IUPAC nomenclature allows chemists worldwide to communicate effectively about chemical compounds, ensuring accuracy and safety in research and industrial applications.
The correct formula for a primary amine is R − N H 2 . The chemical name for the ester C H 3 C H 2 C H 2 C H 2 COOC H 3 is Methyl pentanoate (Option B). The IUPAC name for the alcohol C H 3 C H ( O H ) C H 2 C H ( C H 3 ) C H 3 is 4-methylpentan-2-ol (Option C).
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