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CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives)


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21 Questions MCQ Test | CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives)

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CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 1

Only One Option Correct Type

Direction (Q. Nos. 1-6) This section contains 6 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.

Q. 

Which of the following is most easily decarboxylated on heating?

Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 1

β-keto undergo easier decarboxylation via six membered cyclic intermediate.

CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 2

Which of the following reaction fail to occur spontaneously as written?

Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 2

Here the more stable acid derivative ester is being converted into less stable anhydride.

CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 3

Which of the following gives a cyclic anhydride on heating ?

Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 3

The two —COOH groups are syn, can form cyclic anhydride.

CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 4

What is the increasing order of reactivity of the followings towards base catalysed hydrolysis reaction?

I. CH3CONH2
II. CH3COOCH3

IV. C6H5COCl

Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 4

Rate of hydrolysis follow the order of reactivity of acid derivatives towards nucleophilic acyl substitution.

CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 5

In the reaction given below, the major organic product formed is

Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 5

CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 6

In the reaction given below, the major organic product is

Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 6

*Multiple options can be correct
CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 7

One or More than One Options Correct Type

Direction (Q. Nos. 7-10) This section contains 4 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Q. 

Which reagent(s) can convert benzoic acid into corresponding acid chloride?

Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 7

All these reagents convert acid into acid chloride. HCI does not react with RCOOH to give RCOCI.

*Multiple options can be correct
CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 8

Which reaction condition can convert butanoic acid into methyl butanoate?

Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 8




(c) Amide do not undergo nucleophilic acyl substitution to give less stable acid derivative ester.

*Multiple options can be correct
CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 9

What is/are correct regarding the following acyl substitution reaction

Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 9

Nucleophilic acyl substitution shown above is bimolecular, second order reaction. Therefore, presence of electron withdrawing groups like —NO2 in the ring increases reactivity. Polar aprotic solvents like DMSO increases reactivity of bimolecular nucleophilic substitution reaction.

*Multiple options can be correct
CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 10

Which is/are not a suitable nucleophilic substitution reaction ?

Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 10

(a) Grignard reagent attack further on ketone. (c) Grignard reagent takes from amide.

CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 11

Comprehension Type

Direction (Q. Nos. 11-13) This section contains a paragraph, describing theory, experiments, data, etc.
Three questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (bj, (c) and (d).

Passage

In a nucleophilic acyl substitution reaction, a more reactive acid derivative is spontaneously converted into a more stable acid derivative :

Here X- could be Cl-, Br- , RO-, RCOO- or . The reaction is found to be bimolecular. 

Q. 

The leaving ability of X- is in order of

Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 11

Stronger bases are stronger nucle ophiles (usually), hence poor leaving groups.

CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 12

In a nucleophilic acyl substitution reaction, a more reactive acid derivative is spontaneously converted into a more stable acid derivative :

Here X- could be Cl-, Br- , RO-, RCOO- or . The reaction is found to be bimolecular. 

Q. 

If X is Cl, the increasing order of reactivity of the following with CH3ONa is




Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 12

Electron withdrawing group on phenyl ring increases electrophilicity of carboxyl group and vice versa. Hence, III is most reactive and II is most stabl

CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 13

In a nucleophilic acyl substitution reaction, a more reactive acid derivative is spontaneously converted into a more stable acid derivative :

Here X- could be Cl-, Br- , RO-, RCOO- or . The reaction is found to be bimolecular. 

Q. 

How benzoic acid X be most efficiently be converted into 2-phenyl propene?

Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 13


CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 14

Statement Type

Direction (Q. Nos. 14-17) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

Q. 

Statement I : Ethanoic anhydride on heating with ammonia gives ethanamide.

Statement II : Amide is more stable acid derivative than anhydride.

Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 14

In nucleophilic acyl substitution, a more reactive acid derivative is converted into a more stable acid derivative.

CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 15

Statement I : CH3COOH when treated with   is formed.

Statement II : In Fischer esterification, protonated acid undergo nucleophilic attack by alcohol in the slow, rate determining step.

Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 15


The above intermediate dehydrate to give ester in which oxygen (starred) of alcohol is retained in ester.

CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 16

Statement I : 1-butene, when treated with acetic acid in the presence of H2SO4, produces racemic mixture of 2-butylpropanoate.

Statement II : Acetic acid undergo electrophilic addition at olefinic bond in the presence of an acid catalyst.

Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 16

Both are independently correct but formation of racemic mixture of ester is due to attack of acid on planar carbocation 

CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 17

Statement I : In the following reaction,

 Racemic mixture of esters.

Statement II : Alcohol (P) undergo nucleophilic addition on protonated acetic acid.

Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 17

Both are independently correct but formation of racemic mixture of esters is due to the formation of racemic mixture of alcohols (P) by hydride ion attack on planar carbonyl carbon of butanone.

*Answer can only contain numeric values
CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 18

One Integer Value Correct Type

Direction (Q. Nos. 18-21) This section contains 4 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

Q. 

A polycarboxylic acid (X) has neutralisation equivalent of 65.5. X when treated with excess of SOCI2 followed by excess of CH3ONa(aq), gives ester of molar mass 318. What is the basicity of original acid?


Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 18

(4) In the given reaction : 
A net gain in molar mass of 14 unit is observed per —COOH present. Let there be “n" —COOH group (basicity) be present.
Hence, molar mass of acid = 65.5 n
Molar mass of ester = 65.5n + 14n = 79.5n = 318

*Answer can only contain numeric values
CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 19

Dicarboxylic acid HOOC —(CH2)n —COOH on heating alone undergo cyclisation giving cyclic anhydride. For this reaction, what should be the minimum values of n?


Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 19

If n is less than 2, decarboxylation is preferred over cyclisation.

*Answer can only contain numeric values
CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 20

If one of the isomer of a hydrocarbon on treatment with hot, concentrated alkaline, KMnO4 followed by acidic work up gives phthalic acid without loss of any carbon atoms, how many total isomers of hydrocarbon are possible, each containing a phenyl ring?


Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 20

*Answer can only contain numeric values
CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 21

If disodium salt of propanedioic acid is treated with excess of COCI2 a cyclic compound X is formed. How many lone pair of electrons are present in X?


Detailed Solution for CPU 3 - Introduction To Acid Derivatives (Carboxylic Acids And Acid Derivatives) - Question 21

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