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The Lucas test is used to distinguish small (7 or fewer carbons) 1°, 2° and 3° alcohols. The alcohol to be tested is added to a solution of anhydrous ZnCI2 in conc. HCI at room temperature. Which of the following statements is not correct ?
- a)1° alcohols dissolve, but do not react
- b)3° alcohols react quickly to give an insoluble alkyl chloride
- c)3° alcohols rapidly dehydrate, and the gaseous alkene bubbles out of the test solution
- d)2° alcohols dissolve and react slowly to give an insoluble alkyl chloride
Correct answer is option 'C'. Can you explain this answer?
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The Lucas test is used to distinguish small (7 or fewer carbons) 1, 2 ...
White turbidity of alkyl halide is formed rather than gaseous alkene is formed.
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The Lucas test is used to distinguish small (7 or fewer carbons) 1, 2 ...
Explanation:
The Lucas test is a chemical test used to distinguish between primary, secondary, and tertiary alcohols based on their reactivity with anhydrous ZnCl2 in concentrated HCl. The reaction involves the formation of an alkyl chloride, which can be observed as a precipitate or as a color change in the test solution.
The correct statement among the given options is option 'C', which states that 3 alcohols rapidly dehydrate, and the gaseous alkene bubbles out of the test solution. This statement is not correct because 3 alcohols do not undergo dehydration under the Lucas test conditions.
Key Points:
1. Lucas Test: The Lucas test is performed by adding the alcohol to be tested to a mixture of anhydrous ZnCl2 and concentrated HCl at room temperature.
2. Primary Alcohols: Primary alcohols (1 alcohols) dissolve in the test solution but do not react with ZnCl2 and HCl. They do not produce a precipitate or a color change.
3. Secondary Alcohols: Secondary alcohols (2 alcohols) dissolve in the test solution and react slowly with ZnCl2 and HCl to form an insoluble alkyl chloride. The formation of a turbidity or a white precipitate indicates the presence of a secondary alcohol.
4. Tertiary Alcohols: Tertiary alcohols (3 alcohols) react rapidly with ZnCl2 and HCl to form an insoluble alkyl chloride. A color change, such as from colorless to yellow or cloudy, indicates the presence of a tertiary alcohol.
5. Dehydration: Dehydration is a process in which water molecules are eliminated from a compound to form an alkene. The Lucas test does not involve dehydration and does not produce gaseous alkenes.
6. Difference between 2 and 3 Alcohols: The key difference between 2 and 3 alcohols in the Lucas test is the rate of reaction. 2 alcohols react slowly and form an insoluble alkyl chloride, while 3 alcohols react rapidly and produce an insoluble alkyl chloride.
Conclusion:
The correct statement among the given options is option 'C'. 3 alcohols do not undergo rapid dehydration and do not produce gaseous alkenes in the Lucas test. The Lucas test is a useful tool for distinguishing between primary, secondary, and tertiary alcohols based on their reactivity with anhydrous ZnCl2 and concentrated HCl.
The Lucas test is a chemical test used to distinguish between primary, secondary, and tertiary alcohols based on their reactivity with anhydrous ZnCl2 in concentrated HCl. The reaction involves the formation of an alkyl chloride, which can be observed as a precipitate or as a color change in the test solution.
The correct statement among the given options is option 'C', which states that 3 alcohols rapidly dehydrate, and the gaseous alkene bubbles out of the test solution. This statement is not correct because 3 alcohols do not undergo dehydration under the Lucas test conditions.
Key Points:
1. Lucas Test: The Lucas test is performed by adding the alcohol to be tested to a mixture of anhydrous ZnCl2 and concentrated HCl at room temperature.
2. Primary Alcohols: Primary alcohols (1 alcohols) dissolve in the test solution but do not react with ZnCl2 and HCl. They do not produce a precipitate or a color change.
3. Secondary Alcohols: Secondary alcohols (2 alcohols) dissolve in the test solution and react slowly with ZnCl2 and HCl to form an insoluble alkyl chloride. The formation of a turbidity or a white precipitate indicates the presence of a secondary alcohol.
4. Tertiary Alcohols: Tertiary alcohols (3 alcohols) react rapidly with ZnCl2 and HCl to form an insoluble alkyl chloride. A color change, such as from colorless to yellow or cloudy, indicates the presence of a tertiary alcohol.
5. Dehydration: Dehydration is a process in which water molecules are eliminated from a compound to form an alkene. The Lucas test does not involve dehydration and does not produce gaseous alkenes.
6. Difference between 2 and 3 Alcohols: The key difference between 2 and 3 alcohols in the Lucas test is the rate of reaction. 2 alcohols react slowly and form an insoluble alkyl chloride, while 3 alcohols react rapidly and produce an insoluble alkyl chloride.
Conclusion:
The correct statement among the given options is option 'C'. 3 alcohols do not undergo rapid dehydration and do not produce gaseous alkenes in the Lucas test. The Lucas test is a useful tool for distinguishing between primary, secondary, and tertiary alcohols based on their reactivity with anhydrous ZnCl2 and concentrated HCl.
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The Lucas test is used to distinguish small (7 or fewer carbons) 1, 2 and 3 alcohols. The alcohol to be tested is added to a solution of anhydrous ZnCI2 in conc. HCI at room temperature. Which of the following statements is not correct ?a)1 alcohols dissolve, but do not reactb)3 alcohols react quickly to give an insoluble alkyl chloridec)3 alcohols rapidly dehydrate, and the gaseous alkene bubbles out of the test solutiond)2 alcohols dissolve and react slowly to give an insoluble alkyl chlorideCorrect answer is option 'C'. Can you explain this answer?
Question Description
The Lucas test is used to distinguish small (7 or fewer carbons) 1, 2 and 3 alcohols. The alcohol to be tested is added to a solution of anhydrous ZnCI2 in conc. HCI at room temperature. Which of the following statements is not correct ?a)1 alcohols dissolve, but do not reactb)3 alcohols react quickly to give an insoluble alkyl chloridec)3 alcohols rapidly dehydrate, and the gaseous alkene bubbles out of the test solutiond)2 alcohols dissolve and react slowly to give an insoluble alkyl chlorideCorrect answer is option 'C'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about The Lucas test is used to distinguish small (7 or fewer carbons) 1, 2 and 3 alcohols. The alcohol to be tested is added to a solution of anhydrous ZnCI2 in conc. HCI at room temperature. Which of the following statements is not correct ?a)1 alcohols dissolve, but do not reactb)3 alcohols react quickly to give an insoluble alkyl chloridec)3 alcohols rapidly dehydrate, and the gaseous alkene bubbles out of the test solutiond)2 alcohols dissolve and react slowly to give an insoluble alkyl chlorideCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The Lucas test is used to distinguish small (7 or fewer carbons) 1, 2 and 3 alcohols. The alcohol to be tested is added to a solution of anhydrous ZnCI2 in conc. HCI at room temperature. Which of the following statements is not correct ?a)1 alcohols dissolve, but do not reactb)3 alcohols react quickly to give an insoluble alkyl chloridec)3 alcohols rapidly dehydrate, and the gaseous alkene bubbles out of the test solutiond)2 alcohols dissolve and react slowly to give an insoluble alkyl chlorideCorrect answer is option 'C'. Can you explain this answer?.
The Lucas test is used to distinguish small (7 or fewer carbons) 1, 2 and 3 alcohols. The alcohol to be tested is added to a solution of anhydrous ZnCI2 in conc. HCI at room temperature. Which of the following statements is not correct ?a)1 alcohols dissolve, but do not reactb)3 alcohols react quickly to give an insoluble alkyl chloridec)3 alcohols rapidly dehydrate, and the gaseous alkene bubbles out of the test solutiond)2 alcohols dissolve and react slowly to give an insoluble alkyl chlorideCorrect answer is option 'C'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about The Lucas test is used to distinguish small (7 or fewer carbons) 1, 2 and 3 alcohols. The alcohol to be tested is added to a solution of anhydrous ZnCI2 in conc. HCI at room temperature. Which of the following statements is not correct ?a)1 alcohols dissolve, but do not reactb)3 alcohols react quickly to give an insoluble alkyl chloridec)3 alcohols rapidly dehydrate, and the gaseous alkene bubbles out of the test solutiond)2 alcohols dissolve and react slowly to give an insoluble alkyl chlorideCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The Lucas test is used to distinguish small (7 or fewer carbons) 1, 2 and 3 alcohols. The alcohol to be tested is added to a solution of anhydrous ZnCI2 in conc. HCI at room temperature. Which of the following statements is not correct ?a)1 alcohols dissolve, but do not reactb)3 alcohols react quickly to give an insoluble alkyl chloridec)3 alcohols rapidly dehydrate, and the gaseous alkene bubbles out of the test solutiond)2 alcohols dissolve and react slowly to give an insoluble alkyl chlorideCorrect answer is option 'C'. Can you explain this answer?.
Solutions for The Lucas test is used to distinguish small (7 or fewer carbons) 1, 2 and 3 alcohols. The alcohol to be tested is added to a solution of anhydrous ZnCI2 in conc. HCI at room temperature. Which of the following statements is not correct ?a)1 alcohols dissolve, but do not reactb)3 alcohols react quickly to give an insoluble alkyl chloridec)3 alcohols rapidly dehydrate, and the gaseous alkene bubbles out of the test solutiond)2 alcohols dissolve and react slowly to give an insoluble alkyl chlorideCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE.
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The Lucas test is used to distinguish small (7 or fewer carbons) 1, 2 and 3 alcohols. The alcohol to be tested is added to a solution of anhydrous ZnCI2 in conc. HCI at room temperature. Which of the following statements is not correct ?a)1 alcohols dissolve, but do not reactb)3 alcohols react quickly to give an insoluble alkyl chloridec)3 alcohols rapidly dehydrate, and the gaseous alkene bubbles out of the test solutiond)2 alcohols dissolve and react slowly to give an insoluble alkyl chlorideCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for The Lucas test is used to distinguish small (7 or fewer carbons) 1, 2 and 3 alcohols. The alcohol to be tested is added to a solution of anhydrous ZnCI2 in conc. HCI at room temperature. Which of the following statements is not correct ?a)1 alcohols dissolve, but do not reactb)3 alcohols react quickly to give an insoluble alkyl chloridec)3 alcohols rapidly dehydrate, and the gaseous alkene bubbles out of the test solutiond)2 alcohols dissolve and react slowly to give an insoluble alkyl chlorideCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of The Lucas test is used to distinguish small (7 or fewer carbons) 1, 2 and 3 alcohols. The alcohol to be tested is added to a solution of anhydrous ZnCI2 in conc. HCI at room temperature. Which of the following statements is not correct ?a)1 alcohols dissolve, but do not reactb)3 alcohols react quickly to give an insoluble alkyl chloridec)3 alcohols rapidly dehydrate, and the gaseous alkene bubbles out of the test solutiond)2 alcohols dissolve and react slowly to give an insoluble alkyl chlorideCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice The Lucas test is used to distinguish small (7 or fewer carbons) 1, 2 and 3 alcohols. The alcohol to be tested is added to a solution of anhydrous ZnCI2 in conc. HCI at room temperature. Which of the following statements is not correct ?a)1 alcohols dissolve, but do not reactb)3 alcohols react quickly to give an insoluble alkyl chloridec)3 alcohols rapidly dehydrate, and the gaseous alkene bubbles out of the test solutiond)2 alcohols dissolve and react slowly to give an insoluble alkyl chlorideCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice JEE tests.
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