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NEET Chemistry MCQ
Carboxylic Acids And Their Derivatives Mcq Neet Chemistry
Quiz 1
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Q.1
tion Q1) Identify the major products P, Q and R in the following sequence of reactions : [ NEET 2018]
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a)
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b)
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c)
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d)
Explanation
Answer : (d)
Q.2
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their .... ..[NEET 2018]
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a) more extensive association of carboxylic acid via van der Waals force of attraction
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b) formation of carboxylate ion
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c) formation of intramolecular H-bonding
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d) formation of intermolecular H-bonding
Explanation
Answer : (d)
Q.3
Than One Correct Answer Q3) On warming with iodine anad aqueous sodium hydroxide a pale yellow precipitate and sodium salt of an acid having the formula HOOC - CH2 - CH2 - COOH is formed. The structural formula of the compound could be
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a) CH3 - CO - CH2 . CH2 - CH3
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b)CH3COCH2 - CH(CH3)COOH
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c) CH3 . CO. CH2. CH2 - COOH
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d) CH3.CO.CH2.CH2.COCH3
Explanation
Answer : (c,d)
Q.4
Than One Correct Answer Q4) Acetyl chloride does not react with
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a) ethanol
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b) ethanal
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c) diethyl ether
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d) propanal
Explanation
Answer : (b,d)
Q.5
Acetyl chloride cannot be obtained by treating acetic acid with
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a) PCl5
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b) SOCl2
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c) CHCl3
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d) PCl3
Explanation
except CHCl3 all other replaces -OH group or to replace carbonylic oxygen Answer : (c)
Q.6
Long chain carboxylic acids are called fatty acids because
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a) the molecule is very fatty
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b) the molecules were first found in natural fat
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c) they have fattering effect
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d) none of the above
Explanation
Fats are esters of higher acids Answer : (d)
Q.7
tion Q7) In the cmopund given below the correct correr of acidity of the position (X), (Y) and (Z) is ... ...[ IIT 2004]
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a) Z > X > Y
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b) X > Y > Z
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c) X > Z > Y
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d) Y > X > Z
Explanation
Position X is most acidic being carboxylic group Position Y is closed to an electron withdrawing group -COOH hence more acidic than Z. Answer : (b)
Q.8
On treatment of citric acid with fuming H2SO4, which of the following is produced?
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a) Acetone dicarboxylic acid
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b) Citraconic anhydride
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c) Dihydroxy acetone
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d) Acetone
Explanation
Answer : (a)
Q.9
A fruity smell is produced by the reaction of C2H5OH with
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a) CH3COCH3
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b) PCl5
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c) CH3COOH
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d) none of these
Explanation
Alcohol react with carboxylic acid to produce esters which have a characteristic fruity odour Answer : (c)
Q.10
Which of the following orders of relative strength of acid is correct?
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a) FCH2COOH > ClCH2COOH > BrCH2COOH
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b) ClCH2COOH > BrCH2COOH > FCH2COOH
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c) BrCH2COOH > ClCH2COOH > FCH2COOH
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d) ClCH2COOH > FCH2COOH > BrCH2COOH
Explanation
-I effect of the substituent follows the order F > Cl > Br Hence order of relative strength is as per option "a" Answer : (a)
Q.11
Than One Correct Answer Q11) Acetyl chloride does not react with
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a) ethanol
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b) ethanal
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c) diethyl ether
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d) propanal
Explanation
Answer : (b,d)
Q.12
Which of the following is the weakest acid?
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a) CH3COOH
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b) HCOOH
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c)
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d)
Explanation
Phenols are weaker acid than carboxylic acids Answer : (d)
Q.13
Lactic acid on heating with dil. H2SO4 gives
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a) Acrylic acid
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b) Acetic acid
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c) Propionic acid
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d) Formic acid
Explanation
Answer : (d)
Q.14
Which of the following orders is wrong with respect to property indicated?
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a) Aniline > Cyclohexylamine > Benzamide ( Base strength)
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b) Formic acid > Acetic acid > Propionic acid ( Acid strength)
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c) Benzoic acid > Phenol > Cyclohexanol ( Acid strength )
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d) Fluoro acetic acid > Chloro acetic acid > Bromoa acetic acid ( Acid strength)
Explanation
Cyclohexylamines are more basic than anilin, the later shows resonance Answer : (a)
Q.15
An organic compound is boiled with alcoholic potash. the product is cooled and acidified with HCl. A white solid separates out. The starting compound may be .... ...[ karnataka CET 2004]
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a) Ethyl acetate
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b) Ethyl formate
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c) Ethyl benzoate
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d) Methyl acetate
Explanation
Answer : (c)
Q.16
Consider the acidity of the carboxylic acids .... .. [ AIEEE 2004] I. PhCOOH II. o-NO2C6H4COOH III. p-NO2C6H4COOH IV) m-NO2C6H4COOH
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a) I > II > III > IV
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b) II > III > IV > I
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c) II > IV > I > III
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d) II > IV > III > I
Explanation
The nitro group attached to a conjugated system shows strong -M effect, and this decreases the electron density more at the ortho and para positions than at the meta position. This factor helps greater stabilisation of the conjugate base of the ortho and para isomers than that of the meta isomer. So, meta nitrophenol is the weakest in terms of acidity. Answer : (b)
Q.17
ion Q17) The correct order of reactivity of PhMgBr with ... ... [ IIT 2004]
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a) I > II > III
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b) III > II > I
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c) II > III > I
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d) I > III > II
Explanation
Presence of bulky group around carbonyl group creates steric hindrance for the attack of Grignard reagent. Hence order of reactivity would be as per option "c" Answer : (c)
Q.18
Reactivity of acids in esterification follows the order
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a) CH3COOH > HCOOH > R3CCOOH > R2CHCOOH > RCH2COOH
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b) HCOOH > CH3COOH > RCH2COOH > R2CHCOOH > R3CCOOH
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c) R3CCOOH > R2CHCOOH > RCH2COOH > CH3COOH > HCOOH
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d) none of the avove
Explanation
+IE effect of alkyl group, intesifies the -ve chargeon carboxylate ion and thus make it more reactive Answer : (b)
Q.19
CH3CO2C2H5 on reaction with sodium ethoxide in ethanol gives X, which on heating in the presence of acid gives 'Y' Compound Y is
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a) CH3COCH3
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b) CH3COCH2COOH
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c)
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d)
Explanation
Answer : (b)
Q.20
Select the pKa value of the strongest acid from the following ... [KCET 2004]
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a) 1.0
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b) 2.0
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c) 3.0
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d) 4.5
Explanation
Smaller the value of pKa stronger is the acid Answer : (a)
Q.21
tion : Acetate ion is more basic than methoxide ion Reason : Acetate ion is resonance stabilised
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
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c) Assertion is true but, Reason is false
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d) Assertion is false but, Reason is true
Explanation
Answer : (d)
Q.22
Indicate the organic structure for product expected when 2-methyl propene is heated with acetyl chloride in presence of anhydrous ZnCl2
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a)
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b)
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c)
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d)
Explanation
Addition according to Markownikoff's rule Answer : (d)
Q.23
ion More Than One Correct Answer Q23) The compound will show
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a) tautomerism
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b) optical isomerism
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c) geometrical isomerism
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d) none of these
Explanation
Answer : (b,c)
Q.24
ion Q24) The product of the following reaction is
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a) Ethyl ethanoate
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b) Formic acid
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c) CO and H2O
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d)Ethanoic anhydride
Explanation
Answer : (d)
Q.25
In the anion HCOO- the two carbon oxygen bonds are found to be of equal legth. What is the reason for it? ... ... [ AIEEE 2004]
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a) The anion HCOO- has two equivalent resonating structures
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b) The anion is obtained by removal of proton from the acid molecule
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c) Electronic orbitals of carbon atom are hybridised
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d) The C=O bond is weaker than the C-O bond
Explanation
Answer : (a)
Q.26
ion Q26) The reaction is known as
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a) Koch reaction
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b) Wurtz reaction
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c) Kolbe's reaction
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d) Clemmensen's reduction
Explanation
Answer : (a)
Q.27
ion Q27) The decreasing order of nucleophilicity among the nucleophilies is c) CH3O- d) CH-
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a) d, c, a, b
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b) a, b, c, d
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c) d, c, b, a
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d) c,b, a, d
Explanation
Answer : (a)
Q.28
Acetic acid is manufactured by the fermentation of
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a) Ethanal
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b) Methanol
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c) Methanal
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d) Ethanol
Explanation
Answer : (d)
Q.29
For hydrolysis of the following functional groups, the decreasing order of reactivity is
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a) RCOOR > RCONH2 > RCOCl
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b) RCOOR > RCOCl > RCONH2
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c) RCOCl > RCONH2 > RCOOR
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d) RCOCl > RCOOR > RCONH2
Explanation
The reactivity order of acid derivatives is based on nature of leaving group, resonance and inductive effect Answer : (d)
Q.30
tion :Trichloro acetic acid is stronger than acetic acid Reason : Electron withdrawing substituents decrease the acidic nature
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
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c) Assertion is true but, Reason is false
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d) Assertion is false but, Reason is true
Explanation
Answer : (c)
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