NEET Chemistry Chapter Wise Mock Test – Aldehydes, Ketones and Carboxylic Acids

NEET Chemistry Chapter Wise Mock Test – Aldehydes, Ketones and Carboxylic Acids

Question 1.
A compound does not react with 2,4-dinitrophenyl hydrazine, compound is
(a) acetone
(b) acetaldehyde
(c) CH₃OH
(d) CH₃CH₂COCH₃

Question 2.
When ethanal reacts with CH₃MgBr and C₂H₅OH/dry HCl, the product formed are
(a) methyl alcohol and 2-propanol
(b) ethane and hemiacetal
(c) 2-propanol and acetal
(d) propane and methyl acetate

Question 3.
Arrange the following compounds in decreasing order of their boiling points.
CH₃CHO, CH₃CH₂OH, CH₃OCH₃, CH₃CH₂CH₃
(a) CH₃CH₂CH₃ < CH₃OCH₃ < CH₃CHO < CH₃CH₂OH
(b) CH₃CH₂CH₃ < CH₃CHO < CH₃OCH₃< CH₃CH₂OH
(c) CH₃CH₂CH₃ > CH₃CHO > CH₃OCH₃> CH₃CH₂OH
(d) CH₃CH₂OH > CH₃CHO > CH₃OCH₃ > CH₃CH₂CH₃

Question 4.
Which of the following compounds on heating with aqueous KOH, produces acetaldehyde?
(a) CH₃COCl
(b) CH₃CH₂Cl
(C) CH₂ClCH₂Cl
(d) CH₃CHCl₂

Question 5.
Which of the following give an explosive RDX on nitration?
(a) Toluene
(b) Benzene
(c) Guanidine
(d) Urotropine

Question 6.
The reagent used for the separation of acetaldehyde from acetophenone is
(a) NaHS0₃
(b) C₆H₅NHNH₂
(c) NH₂OH
(d) NaOH-I₂

Question 7.
An aromatic compound ‘X’ with molecular formula C₉H₁₀O gives the following chemical tests
(i) It forms 2,4-DNP derivative.
(ii) It reduces Tollen’s reagent.
(iii) It undergoes Cannizzaro reaction.
(iv) On vigorous oxidation, 1,2-benzenedicarboxylic acid is obtained.
Compound X is

Question 8.
Self condensation of acetaldehyde in the presence of dilute alkalies gives
(a) an acetal
(b) an aldol
(c) mesitylene
(d) propionaldehyde’

Question 9.

Question 10.
Which of the following compounds will not undergo aldol condensation?
(a) Methanal
(b) 2-methyl pentanal
(c) Cyclohexanone
(d) 1-phenyl propanone

Question 11.
In Cannizaro reaction given below,

the slowest step is
(a) the attack of OH-
(b) the transfer of hydride to the carbonyl group
(c) the abstraction of proton from the carboxylic group
(d) the deprotonation of PhCH₂OH

Question 12.
Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid?
(a) Phenol
(b) Benzoic acid
(c) Butanal
(d) Benzaldehyde

Question 13.

Question 14.

Question 15.

Question 16.

Question 17.

(a) phenol and benzoic acid in the presence of NaOH
(b) phenol and benzoyl chloride in the presence of pyridine
(c) phenol and benzoyl chloride in the presence of ZnCl₂
(d) phenol and benzaldehyde in the presence of palladium

Question 18.
Ketones react with Mg-Hg over water gives
(a) pinacolone
(b) pinacol
(c) alcohol
(d) None of these

Question 19.
An organic compound X on treatment with acidified K₂Cr₂O₇ gives compound Y which reacts with I₂ and sodium carbonate to form triiodomethane. The compound X can be
(a) CH₃OH
(b) CH₃CHO
(C) CH₃COCH₃
(d) CH₃CH(OH)CH₃

Question 20.
Which of the following compounds with molecular formula C₅H₁₀ yields acetone on ozonolysis?
(a) 2-methyl-2-butene
(b) 3-methyl-1-butene
(c) Cyclopentane
(d) 2-methyl-1 -butene

Question 21.
Which is not true about acetophenone?
(a) On oxidation with alkaline KMnO₄ followed by hydrolysis gives benzoic acid
(b) Reacts with I₂/NaOH to form iodoform
(c) Reacts with Tollen’s reagent to form silver mirror
(d) Reacts to form 2,4-dinitrophenyl hydrazine

Question 22.
A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of α-hydroxy acid. The carbonyl compound is
(a) acetaldehyde
(b) acetone
(c) diethyl ketone
(d) formaldehyde

Question 23.
A liquid was mixed with ethanol and a drop of concentrated H₂SO₄ was added. A compound with a fruity smell was formed. The liquid was
(a) CH₃OH
(b) HCHO
(c) CH₃COCH₃
(d) CH₃COOH

Question 24.
By combining the two calcium salts of carboxylic acids, we are preparing 2-butanone. Find the correct pair from the following
(a) Calcium formate+Calcium propanoate
(b) Calcium acetate+Calcium propanoate
(c) Calcium acetate+Calcium acetate
(d) Calcium formate+Calcium acetate

Question 25.
Which of the following represents the correct order of the acidity in the given compounds?
(a) CH₃COOH > BrCH₂COOH > ClCH₂COOH> FCH₂COOH
(b) FCH₂COOH > CH₃COOH > BrCH₂COOH > ClCH₂COOH
(c) BrCH₂COOH > ClCH₂COOH > FCH₂COOH> CH₃COOH
(d) FCH₂COOH > ClCH₂COOH > BrCH₂COOH > CH₃COOH

Question 26.
Consider the acidity of the following carboxylic acids.
I. PhCOOH
II. o-NO₂C₆H₄COOH
III. p-NO₂C₆H₄COOH
IV. m – NO₂C₆H₄COOH
Which of the following order is correct?
(a) I > II > III > IV
(b) II > IV > III > I
(c) II > IV > I > III
(d) II > III > IV > I

Question 27.
In the following reaction,

The major amounts of X and Y are
(a) RCHBrCONH₂;RCH(NH₂)COOH
(b) RCHBrCOOH; RCH(NH₂)COOH
(c) RCH₂COBr; RCH₂COONH₄
(d) RCHBrCOOH; RCH₂CONH₂

Question 28.
The property which distinguishes formic acid from acetic acid is
(a) Only ammonium salt of formic acid on heating gives amide
(b) When heated with alcohol/H₂SO₄, only acetic acid forms ester
(c) Only acetic acid forms salts with alkali
(d) Only formic acid reduces Fehling’s solution

Question 29.
The product of acid hydrolysis of P and Q can be 0 distinguished by

(a) Lucas reagent
(b) 2, 4-DNP
(c) Fehling’s solution
(d) NaHSO₃

Question 30.

Question 31.

Question 32.
Hydrolysis of an ester gives a carboxylic acid which on Kolbe’s electrolysis yield ethane. The ester is
(a) methyl methanoate
(b) methyl ethanoate
(c) methyl methanoate
(d) None of the above

Question 33.
In the following reaction,

X and Y respectively, are
(a) HN₃ and CH₃NH₂
(b) NH₃ andCH₃CONH₂
(c) NH₃ and CH₃NH₂
(d) NH₃ and CH₃CONH₂

Question 34.
Two moles of acetic acid are heated with P₂O₅. The product formed is
(a) 2 moles of ethanol
(b) 2 moles of methyl cyanide
(c) acetic anhydride
(d) formic anhydride

Question 35.
Vinegar obtained from sugarcane has
(a) CH₃COOH
(b) C₆H₅COOH
(c) HCOOH
(d) CH₃CH₂COOH

Direction (Q.NOs.36-37): In the following questions more than one of the answers given may be correct. Select the correct answers and mark it according to the codes.
Codes
(a) 1,2 and 3 are correct
(b) 1 and 2 are correct
(c) 2 and 4 are correct
(d) 1 and 3 are correct

Question 36.
The acids which do not contain a —COOH group are
1. picric acid
2. lactic acid ,
3. carbolic acid
4. propanoic acid

Question 37.
Following conversion can be carried out by using

1. KMnO₄ in alcohol
2. NaClO in a buffer
3. Ag₂O/NaOH, HCl
4. FeCl₃ in a buffer

Question 38.

Question 39.

(a) Cyclopentanoyl anion
(b) Cyclopentanoyl cation .
(c) Cyclopentanoyl radical
(d) Cyclopentanoyl biradical

Question 40.
An organic compound ‘X’ having molecular formula C₅H₁₀O yields phenyl hydrazone and gives negative response to the iodoform test and Tollen’s test. It produces n-pentane on reduction. ‘X’ could be
(a) pentanal
(b) 2-pentanone
(c) 3-pentanone
(d) n-amyl alcohol

Direction (Q.Nos.41-44): Each of these questions contains two statements : Assertion and Reason. Each of, these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a),(b),(c) and (d) given below.
(a) Assertion is true,Reason is true; Reason is the correct explanation for Assertion
(b) Assertion is true,Reason is true; Reason is not the correct explanation for Assertion
(c) Assertion is true,Reason is false
(d) Assertion is false,Reason is true

Question 41.
Assertion: Both o-hydroxy benzaldehyde and p-hydroxy benzaldehyde have same molecular weight and show H-bonding.
Reason: Melting point of p-hydroxy benzaldehyde is more.

Question 42.
Assertion: Isobutanal does not give iodoform test.
Reason: It does not have α-hydrogen.

Question 43.
Assertion: Aspirin can cause ulcer in the stomach.
Reason: The ester group in aspirin gets hydrolysed to acid group in the stomach where the p^H is 2.

Question 44.
Assertion: The oxidation of ketone by perbenzoic acid gives esters.
Reason: Perbenzoic acid oxidises because of the release of nascent oxygen on dissociation.

Question 45.
The correct order of stability of the following tautomeric compounds,is

(a) III > II > I
(b) II > I > III
(c) II > III > I
(d) I > II > III

Question 46.
Reaction by which benzaldehyde cannot be prepared is

Question 47.
CH₃CHO and C₆H₅CH₂CHO can be distinguished chemically by
(a) Benedict’s test
(b) Iodoform test
(c) Tollen’s reagent test
(d) Fehling’s solution test

Question 48.
The correct order of decreasing acidic strength of trichloroacetic acid (A), trifluoroacetic acid (B), acetic acid (C) and formic acid (D) is
(a) B>A>D>C
(b) B>D>C>A
(c) A>B>C>D
(d) A>C>B>D

Question 49.
Acetone is treated with excess of ethanol in the presence of hydrochloric acid. The product obtained is

Question 50.
The product formed in the following reaction

Question 51.
In a set of reactions, m-bromobenzoic acid gave a product D. Identify the product D

Question 52.
Clemmensen reduction of a ketone is carried out in the presence of which of the following?
(a) Zn-Hg with HCl
(b) LiAlH₄
(c) H₂ and Pt as catalyst
(d) Glycol with KOH

Question 53.
The best reagent to convert pent-3-en-2-ol into pent-3-en-2-one is
(a) pyridinium chloro chromate
(b) chromic anhydride in glacial acetic acid
(c) acidic dichromate
(d) acidic permanganate

Question 54.

Question 55.
Which of the following reactions will not result in the formation of carbon-carbon bonds?
(a) Reimer-Tiemann reaction
(b) Cannizzaro reaction
(c) Wurtz reaction
(d) Friedel-Crafts acylation

Question 56.
Given, cyclohexanol (I), acetic acid (II) 2,4,6-trinitrophenol (III) and phenol (IV). In these, the order of decreasing acidic character will be
(a) III>II>IV>I
(b) II>III>I>IV
(c) II>III>IV>I
(d) III>IV>II>I

Question 57.
When ethanal is treated with Fehling’s solution, it gives a precipitate of
(a) Cu₂O
(b) Cu
(c) Cu₃O
(d) CuO

Question 58.
The major organic product formed in the following reaction

Question 59.

Question 60.
Which of the following aldehydes contains α-C atom but does not have any α-H atom?
(a) Propionaldehyde
(b) Benzaldehyde
(c) Isobutyraldehyde
(d) Formaldehyde

Answers:

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