Plus Two Chemistry Chapter Wise Previous Questions Chapter 11 Alcohols, Phenols and Ethers is part of Kerala Plus Two Chemistry Chapter Wise Previous Year Questions and Answers. Here we have given Plus Two Chemistry Chapter Wise Questions and Answers Chapter 11 Alcohols, Phenols and Ethers.
Kerala Plus Two Chemistry Chapter Wise Previous Questions and Answers Chapter 11 Alcohols, Phenols and Ethers
a. Grignard reagents are an important class of organometallic compounds used to prepare alcohols. Identify the compounds A and B and write the formula.
b. Write the name of products formed when salicylic acid is treated with acetic anhydride acid medium. [March-2018]
a. i. A: CH3CH2OH
ii. B: CH3 – CHO
b. Acetylsalicylic acid (aspirin) and acetic acid [only aspirin is required],
Lucas test is used to identify primary, secondary and tertiary alcohols.
a. Explain the process.
b. Name the reagents used in the test, [March-2018]
a. Lucas test: When treated with Lucas reagent, tertiary alcohols from immediate turbidity, secondary alcohols from turbidity within 5 minutes while primary alcohols do not produce turbidity at room temperature. They give \ turbidity only on heating.
b. Lucas reagent is a mixture of cone. HCI and anhydrous ZnCI2.
a. Arrange the following compounds in the order of increasing boiling points: Ethanol, Propane-1-o1, Butan-1-o1, Butan-2-o1
b.n the lab students were asked to carry out the reaction between phenol and cone. HNO3. But one student, ‘A’ carried out the reaction between phenol and dil. HNO3. DO you think that the student ‘A’ got the same result as t others? Substantiate with suitable explanations. [Also write the chemical equations wherever necessary] [March-2017]
a. Ethanol < Propane -l-ol < Butan – 2-ol < Butan -1 -ol.
b. They don’t get the same result. Phenol with dilute nitric acid at low temperature (298 k) phenol yields a mixture of ortho and para nitrophenols.
Phenol with concentrated nitric acid, phenol is converted to 2, 4, 6 – trinitrophenol. The product is commonly known as picric acid. The yield of the reaction product is poor.
a. Complete the following:
b. Explain the following:
ii. Williamson Synthesis [March-2016]
b. Alcohols and phenols react with carboxylic acids, acid chlorides, and acid anhydrides to form esters.
c. It is an important laboratory method for the preparation of symmetrical and unsymmetrical ethers. In this method, an alkyl halide is allowed to react with sodium alkoxide.
Alcohols are compounds with general formula R-OH.
a. Alcohols are soluble in water. What Is the reason?
i. Explain a method for the manufacture of Ethanol.
II. How will you convert phenol to benzene? [March-2015]
a. The lower members of alcohols are soluble in water. This is due to their capability of forming hydrogen bonds with water molecules. As the molecular mass of the alcohol increase, their solubility in water decreases.
a. Write the IUPAC names of all the possible isomers with molecular formula C3H8O.
b. Phenol is usually manufactured from cumene. Write the structure of cumene.
c. Primary, secondary and tertiary alcohols can be distinguished by Lucas test.
i. What is Lucas reagent?
ii Write the observation for primary, secondary and tertiary alcohols in Lucas test. [March-2013]
i. A mixture of cone. HCI and anhydrous ZnCI2 is known as Luca’s reagent.
ii. Alcohols are soluble in Lucas reagent and their halides are immiscible and form turbidity 3° alcohols produce turbidity immediately 2° alcohols produce turbidity within a few minutes whereas 1° alcohol does not produce turbidity at all at room temperature.
a. Write the name or structure of the compounds A and Bm the following reactions.
b. Vapors of alcohol ‘C’on passing over heated copper produce compound ‘D’. ‘D’on reaction with CH3MgCI followed by hydrolysis produce 2 methyl butane -2-ol. Write the name or structure of compounds C and D. [March-2012]
C – butane -2-ol
D – butanone
a. Write one method of preparation of methanol and one method of preparation of ethanol.
b. Name the products obtained when ethanol is treated with CrO3 in an anhydrous medium.
c. The boiling point of ethanol is higher than that of methoxymethane. Give reason. [Say-2012]
c. Due to the presence of hydrogen bonds in ethanol, it has a greater boiling point.
A mixture of conc. HCI and anhydrous ZnCI2 is an important reagent which helps to distinguish between 1°, 2°, and 3° alcohols.
a. Give the name of the above reagent.
b. Give one example of 1°, 2°, and 3° alcohols.
c. Explain how the above reagent helps to distinguish above three types of alcohols. [Say-2011]
a. Lucas reagent
Phenols are more acidic than alcohols.
a. Name the product obtained when phenol is treated with chloroform in the presence of NaOH.
b. Name the above reaction.
c. What is the product obtained when phenol is treated with conc. HNO3?
d. Write the structure and IUPAC name of the above product.
e. Ethanol and propane have comparable molecular masses, but their boiling points differ widely. Which of them has a higher boiling point? Substantiate your answer. [March-2011, 2010, Say-2009]
b. Reimer-Tiemann reaction.
c. Picric acid is formed.
d. Intermolecular hydrogen bonds are present in ethanol. Hence the boiling point of ethanol is higher than propane.
A compound ‘A’ reacts with thionyl chloride to give compound B. B reacts with Mg in ether medium to form a Grignard reagent which is treated with acetone and the product on hydrolysis gives,
Identify A and B. Write down the chemical equations for the reactions involved. [Say-2010]
We hope the Kerala Plus Two Chemistry Chapter Wise Questions and Answers Chapter 11 Alcohols, Phenols and Ethers help you. If you have any query regarding Kerala Plus Two Chemistry Chapter Wise Questions and Answers Chapter 11 Alcohols, Phenols and Ethers, drop a comment below and we will get back to you at the earliest.