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NEET Chemistry MCQ
Carboxylic Acids And Their Derivatives Mcq Neet Chemistry
Quiz 3
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Q.1
Industrial preparation of formic acid involves
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a) reaction of CO2with aqueous NaOH under pressure
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b) passing a mixture of CO and H2 over heated copper at 473K
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c) reaction of CO with methanol at 473K
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d) reaction of CO with aqueous NaOH under pressure
Explanation
Answer : (d)
Q.2
ion Q61) The product of acid hydrolysis of P and Q can be distinguished by ... [ IIT 2003]
0%
a) Lucas reagent
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b) 2,4-DNP
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c) Fehling's solution
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d) NaHSO3
Explanation
On hydrolysis P will give ketone while Q will give aldehyde Aldehyde formed will reduce Fehling's solution Answer : (c)
Q.3
Which of the following reactions is expected to give readily a hydrocarbon product is good yields? [ Punjab CET 2001]
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a)
0%
b)
0%
c)
0%
d)
Explanation
Electrolysis of sodium or potassium salt of carboxylic acid is an appropriate method to produce hydrocarbons 2RCOOH → R-R Answer : (a)
Q.4
Which is most reactive towards nucleophilic substitution among acid derivatives? [ DEC 2006]
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a) (RCO)2O
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b) RCOX
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c) RCONH2
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d) RCOOR
Explanation
The relative reactivities of diff. acid derivatives towards nucleophilic substitution reaction follows the order RCOX > (RCO)2O > RCOOR' > RCONH2 Answer : (b)
Q.5
The OH group of an alcohol or -COOH group of a carboxylic acid can be replaced by -Cl using ... ..[ IIT 2004 ]
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a) Chlorine
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b) Hydrochloric acid
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c) Phosphorus pentachloride
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d) Hypochlorous acid
Explanation
Answer : (c)
Q.6
Hydrogenation of C6H5CHOHCOOH over Rh-Al2O3 catalyst in methanol gives
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a) C6H11CH2COOH
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b) C6H5CH2COOH
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c) C6C11CH2COOH
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d) C6H11CHOHCOOH
Explanation
Answer : (d)
Q.7
Formic acid is not a representative member of the carboxylic acids becuase
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a) it is the first member of the series
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b) it does not contain alkyl group
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c) it is a gas
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d) it contains an aldehydeic group while the other acids do not have the aldehydic group
Explanation
Formic acid have H which is aldehydic group Answer : (d)
Q.8
Given below are some statements concentrating formic acid which of them is true?
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a) It is a weaker acid than acetic acid
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b) It is a reducing agent
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c) When its calcium salt is heated, it forms a ketone
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d) It is an oxidising agent
Explanation
Answer : (b)
Q.9
ion Q68) In a set of reaction acetic acid yields a product [D}. The structure of [D} would be
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a)
0%
b)
0%
c)
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d)
Explanation
A is : CH3COCl B is : C6H5COCH3 C is: D is: Answer : (b)
Q.10
What is formed when oxalic acid is dehydrated by conc.H2SO4?
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a) CO
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b) CO2
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c) C + CO2
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d) CO + CO2
Explanation
Answer : (d)
Q.11
Which of the following is the strongest acid?
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a) CH3COOH
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b) CF3COOH
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c) CBr3COOH
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d) CCl3COOH
Explanation
Greater the -I effect of substituent more is the acidic strength. Thus order of acidic strength is CF3COOH > CCl3COOH > CBr3COOH > CH3COOH Answer : (b)
Q.12
Which of the following carboxylic acid undergoes decarboxylation easily? [ IIT 1995]
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a) C6H5 - CO - CH2 - COOH
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b) C6H5 - CO - COOH
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c) C6H5 - CH(OH) - COOH
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d) C6H5 - CH(NH2) - COOH
Explanation
A β-keto acid readily undergoes decarboxylation on heating via a six membered cyclic transition state for more details you may ref. to our notes onReaction mechanism Answer : (a)
Q.13
The weakest acid among the following is
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a) CCl3COOH
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b) CHCl2COOH
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c) CH3COOH
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d) ClCH2COOH
Explanation
Presence of electron withdrawing substituent increases the acidic strength Answer : (c)
Q.14
General formula (RCO)2O represents
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a) Ketone
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b) Ester
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c) Acid anhydride
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d) Carboxylic acid
Explanation
Answer : (c)
Q.15
Acetamide is ... .... [ ISM Dhandnd 1994]
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a) Amphoteric
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b) Highly basic
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c) Neutral
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d) Highly acidic
Explanation
Amides are amphoteric in nature Answer : (a)
Q.16
Which of the following undergoes hydrolysis?
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a) C6H5CH3
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b) CH3COONa
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c) CH3CONH2
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d) both 'b' and 'c'
Explanation
Answer : (d)
Q.17
The IUPAC name of tartaric acid is
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a) butane-1,4-dicarboxylic acid
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b) 1,4-dihydroxy butane-2,-3-dioic acid
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c) 2,3-dihydroxy butane-1-4-dicarboxylic acid
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d) 1,4-dihydroxy butane-2,3- dicarboxylic acid
Explanation
Answer : (c)
Q.18
An organic acid when heated strongly with P2O5, give rise to a colourless gas which burns with a pale blue flame. The acid is
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a) acetic acid
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b) benzoic acid
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c) formalin
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d) formic acid
Explanation
HCOOH + P2O5 → H2O + CO (burns with pale blue flame) Answer : (d)
Q.19
Glacial acetic acid is obtained by ... ..[ KCET 2002]
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a) Distilling vinegar
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b) Ceystallizing, separating and melting acetic acid
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c) Treating vinegar with dehydrating agent
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d) Chemically separating acetic acid
Explanation
Acetic acid has freezing point of 16.6°C , so it can be obtained by crystallization, separation and then melting Answer : (b)
Q.20
tion : Acetic acid does not undergo haloform reaction Reason : Acetic acid has no α-hydrogen
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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)
Q.21
-COOH group of a compound does not react with NaHSO3 even through it has >C=O group because of
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a) cyclic structure
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b) the attached organic group
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c) acid character
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d) resonance
Explanation
Answer : (d)
Q.22
Cyanohydrin of which of the following forms lactic acid
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a) CH3CH2CHO
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b) CH3CHO
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c) CH3COCH3
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d) HCHO
Explanation
Answer : (b)
Q.23
When acetamide is hydrolysed by boiling with acid the product obtained is
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a) Acetic acid
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b) Acetaldehyde
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c) Ethyl amine
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d) Ethyl alcohol
Explanation
Answer : (a)
Q.24
Oxidation of Butan-2-one to propionic acid can be achived by ... .... [ DEC 1989 ]
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a) NaOH + I2
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b) Br2 Water
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c) Tollen's reagent
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d) Atmospheric oxidation
Explanation
Answer : (a)
Q.25
On mixing ethyl acetate with aqueous sodium chloride, the composition of the resultant solution is ... .. [ AIEEE 2004]
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a) CH3COONa + C2H5OH
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b) CH3COOC2H5 + NaCl
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c) CH3Cl + C2H5COONa
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d) CH3COCl + C2H5OH + NaOH
Explanation
Esters do not react with aqueous NaCl Answer : (b)
Q.26
Reaction of ethyl acetate with excess of CH3MgI followed by hydrolysis gives ... ..[ IIT 1992]
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a) Propanal
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b) n-propyl alcohol
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c) iso-propyl alcohol
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d) tert-butyl alcohol
Explanation
Answer : (d)
Q.27
The reagent that can be used to distinguish between phenol and ethanoic acid is
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a) Fehling solution
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b) Sodium carbonate solution
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c) Ammonical silver nitrate solution
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d) Phenolphthalein
Explanation
Ethanoic acid reacts with sodium carbonate to give brisk effervescence of CO2 where as phenol do not Answer : (b)
Q.28
Which acid gives wine red colour with neutral FeCl3?
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a) Acetic acid
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b) Formic acis
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c) Propanoic acid
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d) none of the above
Explanation
It is a test for acetate radical Answer : (a)
Q.29
The group present in waxes is
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a) Ether group
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b) Ester group
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c) Acid group
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d) Alcohol group
Explanation
Answer : (b)
Q.30
ion Q91) Rate if the reaction, is fastest when Z is .. [ AIEE 2005]
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a) OCOCH3
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b) NH2
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c) OC2H5
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d) Cl
Explanation
Reactivity order for acid derivatives due to better leaving group is RCOCl > (RCO)2O > RCOOR > RCONH2 Answer : (d)
0 h : 0 m : 1 s
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