75 + Interview Questions in Esterification in Unit Processes Page 2 InterviewSolution

51.	What is the other name of ester-interchange reaction?(a) Ketonolysis(b) Alcoholysis(c) Aldehyde(d) None of the mentionedI had been asked this question at a job interview.The question is from Esterification of Carboxylic Aacid and Derivatives topic in section Esterification of Unit Processes
Answer» The correct OPTION is (b) ALCOHOLYSIS The explanation: In the alcoholysis or ester-interchange reaction, an alcohol REACTS with an ester to GIVE a NEW ester.

Discussion

52.	Ethyl acetate is produced by the mixture of ethanol with what?(a) Acetic acid(b) Carboxylic acid(c) Ketones(d) AmidesI got this question in homework.Origin of the question is Completing Esterification topic in chapter Esterification of Unit Processes
Answer» The CORRECT answer is (a) ACETIC ACID Explanation: Ethyl acetate can be made continuously by starting with a mixture of ETHANOL and acetic acid, with some sulfuric acid.

Discussion

53.	How to complete a reaction when acids are volatile?(a) Superheated steam(b) Distillation(c) Catalyst(d) All of the mentionedThis question was posed to me during an interview for a job.My enquiry is from Completing Esterification topic in section Esterification of Unit Processes
Answer» RIGHT option is (b) Distillation Best EXPLANATION: When EITHER or both the acid and the alcohol are volatile, the reaction MAY be carried to completion by distilling out the WATER produced in the reaction, usually as an azeotrope.

Discussion

54.	What should be considered during azeotropic distillation?(a) Solubility(b) Boiling point(c) Both solubility and boiling point(d) None of the mentionedThe question was posed to me during an interview.This key question is from Completing Esterification topic in portion Esterification of Unit Processes
Answer» The correct choice is (c) Both solubility and boiling point Easy explanation: The operating conditions must be adapted to the PARTICULAR ACID and alcohol. Not only must the boiling point of the azeotropes be considered but also the solubilities of the ESTERS and alcohols in WATER.

Discussion

55.	What are the ways to removes water from reaction?(a) Superheated steam(b) Bubbling inert gas(c) Heating(d) All of the mentionedI got this question in semester exam.The question is from Completing Esterification topic in chapter Esterification of Unit Processes
Answer» The correct answer is (d) All of the mentioned Explanation: The removal of the water is aided by bubbling an inert GAS through the mixture or by the application of a vacuum. When the ACID, alcohol, and ester are non-volatile, the mixture is heated, USUALLY to around 200°C or higher, without a catalyst to drive out the water. ANOTHER method of removing the water is to pass superheated steam through the mixture; the steam both AGITATES the mixture and carries off the water as it is formed.

Discussion

56.	What is a Glyceride?(a) Volatile acid(b) Non-volatile acid(c) Neutral(d) None of the mentionedThe question was asked during an interview.My question comes from Completing Esterification topic in portion Esterification of Unit Processes
Answer» The correct CHOICE is (B) Non-volatile acid The BEST I can explain: GLYCERIDE is a non-volatile acid.

Discussion

57.	What effect does removal of water has on esterification?(a) Increase reaction(b) Decrease reacting(c) Completes reaction(d) Acts as catalystI had been asked this question in an interview.This intriguing question originated from Completing Esterification topic in chapter Esterification of Unit Processes
Answer» Correct answer is (c) Completes reaction The explanation: One WAY of COMPLETING an ESTERIFICATION is to remove the water as it is formed. The removal of the water is aided by bubbling an inert gas through the mixture or by the application of a VACUUM.

Discussion

58.	The presence of what enhances the catalytic effect of acids?(a) Copper oxide(b) Nickel(c) Zinc chloride(d) All of the mentionedI got this question in an international level competition.Asked question is from Catalystic Esterification topic in chapter Esterification of Unit Processes
Answer» The correct answer is (c) Zinc chloride For explanation I would say: The presence of zinc chloride seems to enhance the CATALYTIC EFFECT of ACIDS. The addition of a large amount of calcium chloride AIDS in the separation of water as a layer. Zinc and tin chlorides are said to be active catalysts.

Discussion

59.	The use of strong acid is disadvantageous.(a) True(b) FalseI had been asked this question during an interview.This intriguing question originated from Catalystic Esterification topic in portion Esterification of Unit Processes
Answer» Correct OPTION is (a) True The explanation is: The use of any STRONG ACID as a catalyst may cause ISOMERIZATION or destruction of a tertiary alcohol, such as linalool.

Discussion

60.	Which of the following can act as catalyst in esterification process?(a) Sulphuric acid(b) Hydrochloric acid(c) Both H2SO4 and HCl(d) None of the mentionedI have been asked this question by my school principal while I was bunking the class.My question is based upon Catalystic Esterification in division Esterification of Unit Processes
Answer» Right answer is (c) Both H2SO4 and HCl For explanation I would say: In general practice, hydrochloric and sulfuric acids are the catalysts most COMMONLY USED, the FORMER being in favour in the laboratory because of its efficiency and the latter in the PLANT because of its cheapness and lower corrosive EFFECT on metals.

Discussion

61.	What type of compounds are esterification catalyst?(a) Basic(b) Neutral(c) Acidic(d) None of the mentionedI have been asked this question in my homework.I need to ask this question from Catalystic Esterification in chapter Esterification of Unit Processes
Answer» The correct ANSWER is (c) Acidic To explain I would say: Esterification CATALYSTS are compounds which are acidic in NATURE. Acidic compounds, in this case, are those in which the central atom has an incomplete external electron shell, so that besides the hydrogen ION, compounds such as boron trifluoride, aluminium chloride, or ZINC chloride can be considered to be acids.

Discussion

62.	‘R’ being what increases the esterification process?(a) Positive(b) Negative(c) No change(d) None of the mentionedThe question was posed to me during an online interview.Origin of the question is Catalystic Esterification in division Esterification of Unit Processes
Answer» Correct CHOICE is (a) Positive Easy EXPLANATION: While the nature of the R group attached to the carboxyl group will influence this CHARGE, other METHODS, or catalysts, can be used to increase the positive charge so that a given acid will esterify more RAPIDLY.

Discussion

63.	Alcohol oxygen also can act as a base.(a) True(b) FalseThis question was addressed to me during an interview for a job.My doubt is from Catalystic Esterification topic in chapter Esterification of Unit Processes
Answer» The correct ANSWER is (a) True For explanation: The ALCOHOL oxygen also can act as a base TOWARD the acid. However, this reaction hinders esterification and, in addition, may LEAD to DEHYDRATION of the alcohol.

Discussion

64.	Fill in the blank: The larger this positive charge, the more _____ the reaction will be.(a) Slower(b) Faster(c) No change(d) None of the mentionedThis question was posed to me in my homework.My question is taken from Catalystic Esterification in portion Esterification of Unit Processes
Answer» The correct choice is (B) Faster To ELABORATE: The LARGER this POSITIVE charge, the more rapid the reaction will be.

Discussion

65.	As temperature increases, what happens to the esterification?(a) Increases(b) Decreases(c) No change(d) None of the mentionedI had been asked this question in an interview for job.I'd like to ask this question from Catalystic Esterification topic in chapter Esterification of Unit Processes
Answer» The correct ANSWER is (a) Increases The EXPLANATION is: The SPEED of esterification approximately doubles with a 10°C RISE in temperature. Hence, heat is USED to speed up esterification reactions.

Discussion

66.	In acids, low rate of esterification and a low limit of reaction go together.(a) True(b) FalseThe question was asked in an interview.My question is taken from Esterification by Organic Acids in portion Esterification of Unit Processes
Answer» Correct answer is (b) False Easy EXPLANATION: with the alcohols, low rate of esterification and a low limit of reaction GO together, it is quite otherwise with the acids. The esterification of the unsaturated acids, cinnamic and sorbic, STARTS off much more slowly than that of the corresponding SATURATED acids but goes somewhat faster. Formic ACID, which has an extremely high initial rate, has a relatively low limit.

Discussion

67.	How can we fasten the process of esterification?(a) Strong acids(b) Temperature(c) Catalyst(d) All of the mentionedThis question was posed to me in unit test.This key question is from Catalystic Esterification topic in chapter Esterification of Unit Processes
Answer» Right choice is (d) All of the mentioned The best explanation: ESTERIFICATION may be enormously hastened by the ADDITION of a strong ACID, such as sulfuric or HYDROCHLORIC acid. The EQUILIBRIUM point of the reaction is not altered by the catalyst; only the rate of esterification is increased.

Discussion

68.	Which one of the following has the slowest esterification rate?(a) Primary(b) Secondary(c) Tertiary(d) All the mentionedThe question was posed to me in an interview for job.This intriguing question comes from Esterification by Organic Acids in portion Esterification of Unit Processes
Answer» Right choice is (c) Tertiary The explanation is: It is stated that the more branched the carbon chain of the alcohol and the nearer the branches are to the HYDROXYL group, the slower will be its ESTERIFICATION and the lower the limit. These effects are DUE to steric HINDRANCE to the approach of the alcohol to the acid molecule.

Discussion

69.	Esters can decompose to from what?(a) Base(b) Unsaturated hydrocarbon(c) Saturated hydrocarbon(d) All of the mentioned abI have been asked this question at a job interview.The above asked question is from Esterification by Organic Acids in chapter Esterification of Unit Processes
Answer» RIGHT option is (b) UNSATURATED hydrocarbon The explanation is: the ESTERS can decompose to form an unsaturated hydrocarbon and the acid.

Discussion

70.	What type of effect does the phenyl group in benzyl alcohol has?(a) Positive effect(b) Ionic effect(c) Retarding influence(d) None of the mentionedThis question was addressed to me in an interview for internship.My question is based upon Esterification by Organic Acids topic in portion Esterification of Unit Processes
Answer» Right choice is (c) RETARDING influence Best explanation: The presence of the PHENYL GROUP in benzyl ALCOHOL has a retarding influence.

Discussion

71.	Which of the following has the highest initial rate?(a) Ethyl(b) Methyl(c) Propyl(d) All of the mentionedI had been asked this question in a national level competition.This question is from Esterification by Organic Acids topic in section Esterification of Unit Processes
Answer» Right OPTION is (d) All of the mentioned The best explanation: The PRIMARY alcohols, ethyl, propyl, and butyl, have approximately the same initial RATES and limits but are inferior to methyl alcohol in both of these RESPECTS.

Discussion

72.	What is meant by equilibrium constant ‘k’ of the reaction?(a) (esterwater)/ (Acidalcohol)(b) (Esteralcohol)/ (Acidwater)(c) (Acidwater)/ (esteralcohol)(d) None of the mentionedThis question was addressed to me in examination.Origin of the question is Esterification by Organic Acids in division Esterification of Unit Processes
Answer» The CORRECT choice is (a) (esterwater)/ (Acidalcohol) Explanation: The EQUILIBRIUM CONSTANT for the reaction is (esterwater)/ (Acidalcohol), the VALUE of K CHANGES with the presence of salts.

Discussion

73.	Oxygen is more electropositive than carbon.(a) True(b) FalseThe question was asked in an international level competition.I would like to ask this question from Esterification by Organic Acids in section Esterification of Unit Processes
Answer» CORRECT OPTION is (B) False Easiest explanation: Since OXYGEN is more electronegative than CARBON, the carbonyl carbon is more positive than the carbonyl oxygen.

Discussion

74.	Why is there a selectivity in bond breaking process?(a) Reactants(b) Catalyst(c) Electronic structure(d) All of the mentionedThe question was posed to me during an online exam.My question is based upon Esterification by Organic Acids in chapter Esterification of Unit Processes
Answer» Right option is (C) ELECTRONIC structure Best explanation: the selectivity of the bond-breaking PROCESS is found in the electronic structure of the reactants and PRODUCTS. Since oxygen is more electronegative than CARBON, the carbonyl carbon is more positive than the carbonyl oxygen.

Discussion

75.	What are the constituents of ester?(a) Hydrogen(b) Ionized hydrogen(c) Only aromatic(d) All the mentionedI had been asked this question in an international level competition.My doubt stems from Esterification by Organic Acids in section Esterification of Unit Processes
Answer» The CORRECT OPTION is (d) All the mentioned Explanation: An ester is usually DEFINED as a compound formed by substituting an ORGANIC radical for an ionisable hydrogen of an acid.

Discussion

Explore topic-wise InterviewSolutions in .

What is the other name of ester-interchange reaction?(a) Ketonolysis(b) Alcoholysis(c) Aldehyde(d) None of the mentionedI had been asked this question at a job interview.The question is from Esterification of Carboxylic Aacid and Derivatives topic in section Esterification of Unit Processes

Ethyl acetate is produced by the mixture of ethanol with what?(a) Acetic acid(b) Carboxylic acid(c) Ketones(d) AmidesI got this question in homework.Origin of the question is Completing Esterification topic in chapter Esterification of Unit Processes

How to complete a reaction when acids are volatile?(a) Superheated steam(b) Distillation(c) Catalyst(d) All of the mentionedThis question was posed to me during an interview for a job.My enquiry is from Completing Esterification topic in section Esterification of Unit Processes

What are the ways to removes water from reaction?(a) Superheated steam(b) Bubbling inert gas(c) Heating(d) All of the mentionedI got this question in semester exam.The question is from Completing Esterification topic in chapter Esterification of Unit Processes

What is a Glyceride?(a) Volatile acid(b) Non-volatile acid(c) Neutral(d) None of the mentionedThe question was asked during an interview.My question comes from Completing Esterification topic in portion Esterification of Unit Processes

The presence of what enhances the catalytic effect of acids?(a) Copper oxide(b) Nickel(c) Zinc chloride(d) All of the mentionedI got this question in an international level competition.Asked question is from Catalystic Esterification topic in chapter Esterification of Unit Processes

The use of strong acid is disadvantageous.(a) True(b) FalseI had been asked this question during an interview.This intriguing question originated from Catalystic Esterification topic in portion Esterification of Unit Processes

What type of compounds are esterification catalyst?(a) Basic(b) Neutral(c) Acidic(d) None of the mentionedI have been asked this question in my homework.I need to ask this question from Catalystic Esterification in chapter Esterification of Unit Processes

‘R’ being what increases the esterification process?(a) Positive(b) Negative(c) No change(d) None of the mentionedThe question was posed to me during an online interview.Origin of the question is Catalystic Esterification in division Esterification of Unit Processes

Alcohol oxygen also can act as a base.(a) True(b) FalseThis question was addressed to me during an interview for a job.My doubt is from Catalystic Esterification topic in chapter Esterification of Unit Processes

Fill in the blank: The larger this positive charge, the more _____ the reaction will be.(a) Slower(b) Faster(c) No change(d) None of the mentionedThis question was posed to me in my homework.My question is taken from Catalystic Esterification in portion Esterification of Unit Processes

As temperature increases, what happens to the esterification?(a) Increases(b) Decreases(c) No change(d) None of the mentionedI had been asked this question in an interview for job.I'd like to ask this question from Catalystic Esterification topic in chapter Esterification of Unit Processes

In acids, low rate of esterification and a low limit of reaction go together.(a) True(b) FalseThe question was asked in an interview.My question is taken from Esterification by Organic Acids in portion Esterification of Unit Processes

How can we fasten the process of esterification?(a) Strong acids(b) Temperature(c) Catalyst(d) All of the mentionedThis question was posed to me in unit test.This key question is from Catalystic Esterification topic in chapter Esterification of Unit Processes

Which one of the following has the slowest esterification rate?(a) Primary(b) Secondary(c) Tertiary(d) All the mentionedThe question was posed to me in an interview for job.This intriguing question comes from Esterification by Organic Acids in portion Esterification of Unit Processes

Esters can decompose to from what?(a) Base(b) Unsaturated hydrocarbon(c) Saturated hydrocarbon(d) All of the mentioned abI have been asked this question at a job interview.The above asked question is from Esterification by Organic Acids in chapter Esterification of Unit Processes

Which of the following has the highest initial rate?(a) Ethyl(b) Methyl(c) Propyl(d) All of the mentionedI had been asked this question in a national level competition.This question is from Esterification by Organic Acids topic in section Esterification of Unit Processes

Oxygen is more electropositive than carbon.(a) True(b) FalseThe question was asked in an international level competition.I would like to ask this question from Esterification by Organic Acids in section Esterification of Unit Processes

Why is there a selectivity in bond breaking process?(a) Reactants(b) Catalyst(c) Electronic structure(d) All of the mentionedThe question was posed to me during an online exam.My question is based upon Esterification by Organic Acids in chapter Esterification of Unit Processes

What are the constituents of ester?(a) Hydrogen(b) Ionized hydrogen(c) Only aromatic(d) All the mentionedI had been asked this question in an international level competition.My doubt stems from Esterification by Organic Acids in section Esterification of Unit Processes