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NEET Chemistry MCQ
Carboxylic Acids And Their Derivatives Mcq Neet Chemistry
Quiz 4
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Q.1
Weakest acid among the following is .... [ Punjab CET 1996]
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a) Acetic acid
0%
b) Phenol
0%
c) Water
0%
d) Acetylene
Explanation
Acetylene is weak acid even weaker than water. Different compounds can be arranged in oder of acidic strength as carboxylic acids > phenol > water > alcohols > alkyene Answer : (d)
Q.2
An organic liquid has an empirical formula C5H10O. This liquid gives pale yellow precipitate on warming with iodine in alkaline KI solution. The resulting slat upon acidification gives an acid which easily undergoes decarboxylation on mild heatig. The structural formula of the organic liquid could be ... ... [ DEC 2007]
0%
a) H3CCH2CH2CH2CHO
0%
b) CH3CH2CH2OCH = CH2
0%
c) CH3COCH2CH2CH3
0%
d) H2C = CH - CH2 - CH(OH) - CH3
Explanation
Acid (A) is β, γ-unsaturated acid which easily undergoes decarboxylation, due to the stabilization of carbanion Answer : (d)
Q.3
Which one of the following orders of acid strength is correct?
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a) RCOOH > HC ≡ CH > HOH > ROH
0%
b) RCOOH > ROH > HOH > HC ≡ CH
0%
c) RCOOH > HOH > ROH > HC ≡ CH
0%
d) RCOOH > HOH > HC ≡ CH > ROH
Explanation
Answer : (c)
Q.4
Lactic acid on oxidation with Fenton's reagent gives main product
0%
a) H2C2O4
0%
b) CH3COCOOH
0%
c) CH3COOH
0%
d) none of these
Explanation
Answer : (b)
Q.5
Among the following acids which has the lowest pKa value? ... [ AIEEE 2005]
0%
a) CH3COOH
0%
b) HCOOH
0%
c) (CH3)2CH-COOH
0%
d) CH3CH2COOH
Explanation
HCOOH is the strongest acid among the given compounds and hence has lowest pKa Answer : (b)
Q.6
Toluene can be oxidised to benzoic acid by
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a) K2CR2O7 (acidic)
0%
b) KMnO4 (alk.)
0%
c) Both a and b
0%
d) None
Explanation
Answer : (c)
Q.7
Which of the following reactions gives violet colur with neutral ferric chloride?
0%
a) Benzoic acid
0%
b) Salicylic acid
0%
c) Acetic acid
0%
d) Formic acid
Explanation
Salicylic acid contains -OH group hence gives violet colour with neutral FeCl3, which is a characteristic test for phenol Answer : (b)
Q.8
Benzoic acid gives benzene on being heated with X and phenol gives benzene on being heated with Y. Therefore X and Y are respectively
0%
a) Sodalime and zinc dust
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b) Zinc dust and sodium hydroxide
0%
c) Sodalime and copper
0%
d) Zinc dust and sodalime
Explanation
Answer : (a)
Q.9
on Q100) What is Z in the following sequence of reactions?
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a) Toluene
0%
b) Benzaldehyde
0%
c) Benzene
0%
d) Benzoic acid
Explanation
Answer : (d)
Q.10
The term carboxylic is a contraction of two terms
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a) carboxyl and hydroxyl
0%
b) hydroxyl and carboxyl
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c) carbonyl and amine
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d) carbonyl and hydroxyl
Explanation
Answer : (d)
Q.11
on Q102) Y in the above reactions is ... ..[ IIT 1996]
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a) Lactic acid
0%
b) Alanine
0%
c) Ethylamine
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d) Propyl amine
Explanation
C is : CH3 - CH(Br) - COOH Y is CH3 - CH(NH2 - COOH ( propyl amine) Answer : (d)
Q.12
Which of the following compounds will brisk effervescences of CO2 on treatment with NaHCO3
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a) Acetic acid
0%
b) Phenol
0%
c) both a and b
0%
d) none
Explanation
Answer : (a)
Q.13
Which of the following cannot reduce Fehling's solution?
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a) H3CCHO
0%
b) H3CCOOH
0%
c) HCOOH
0%
d) HCHO
Explanation
Compounds containing H-CO- group reduce Fehling solution Answer : (b)
Q.14
Ethyl acetate is obtained when methyl magnesium iodide reacts with ... [ Tamil Nadu CET 2002]
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a) Acetyl chloride
0%
b) Carbon dioxide
0%
c) Ethyl formate
0%
d) Ethyl chloroformate
Explanation
Answer : (d)
Q.15
Saponification of ethyl benzoate with caustic soda as alkali gives
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a) Phenol, ethanoic acid
0%
b) Sodium benzoate, ethanol
0%
c) Benzyl alcohol, ethanoic acid
0%
d) Benzoic acid, sodium ethoxide
Explanation
Answer : (b)
Q.16
Electrolysis of aqueous solution of CH3COOK gives
0%
a) C2H2
0%
b) C2H4
0%
c) CH4
0%
d) C2H6
Explanation
Electrolysis 2CH3COOK + 2H2 → CH3-CH3 + 2CO2 + 2KOH + H2 Answer : (d)
Q.17
The reaction of HCOOH with conc. H2SO4 gives
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a) CO
0%
b) CO2
0%
c) oxalic acid
0%
d) acetic acid
Explanation
CO and H2O is produced Answer : (a)
Q.18
Carboxylic acids are more acidic than phenol and alcohol because of .... [ Tamil nadu CET 2001]
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a) Intermolecular hydrogen bonding
0%
b) Formation of dimers
0%
c) Highly acidic hydrogen
0%
d) Resonance stabilization of their conjugate base
Explanation
Conjugate base of carboxylic acids i.e. carboxylate ion is resonance stabilised Answer : (d)
Q.19
Dimerisation in carboxylic acid is due to ..... [ karnataka CET 2002]
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a) Ionic bond
0%
b) Covalent bond
0%
c) Coordinate bond
0%
d) Intermolecular hydrogen bond
Explanation
Answer : (d)
Q.20
Assertion : Nitrobenzoic acid is more acidic than benzoic acid. Reason : Presence of electron repelling group decreases the acidic character in molecule
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
0%
b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
0%
c) Assertion is true but, Reason is false
0%
d) Assertion is false but, Reason is true
Explanation
Acedic charater due to presence of electron attracting group NO2 Answer : (b)
Q.21
Which one is polyprotic acid?
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a) Benzoic acid
0%
b) Salicylic acid
0%
c) Acetic acid
0%
d) Oxalic acid
Explanation
Oxalic acid is dibasic acid. A polyprotic acid donates more than one proton Answer : (d)
Q.22
When salicylic acid is treated with acetic anhydride we get ... ...[ DEC 2002]
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a) Salol
0%
b) Paracetamol
0%
c) Aspirin
0%
d) none of these
Explanation
Answer : (c)
Q.23
Reaction of acetic anhydride with PCl5 gives
0%
a) Acetic acid
0%
b) Acetaldehyde
0%
c) Acetyl chloride
0%
d) None
Explanation
(CH3CO)2O + PCl5 → 2CH3COCl + POCl3 Answer : (c)
Q.24
Ammonium formate on heating yields
0%
a) ammonia
0%
b) formamide
0%
c) ethyl amine
0%
d) acetamide
Explanation
On heating Amonium formate it give formamide HCOONH4 → HCONH2 + H2O Answer : (b)
Q.25
Which reagent will bring about the conversion of carboxylic acid into ester
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a) C2H5OH
0%
b) LiAlH4
0%
c) Al(OC2H5)3
0%
d) Dry HCl + C2H5OH
Explanation
HCl acts as catalyst reaction is between C2H5OH and carboxylic acid Answer : (d)
Q.26
Which of the following compounds in amphoteric in nature? [ IIT 1993]
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a) CH3CONH2
0%
b) CH3COOC2H5
0%
c) (CH3CO)2O
0%
d) CH3COCl
Explanation
Amides are amphoteric in nature Answer : (a)
Q.27
on Q118) Consider the following reaction compound C is
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a) formic acid
0%
b) acetic acid
0%
c) acetaldehyde
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d) ethyl alcohol
Explanation
Answer : (d)
Q.28
Acetic acid reacts with chlorine in the presence of catalyst anhydrous FeCl3 to give
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a) Chloral hydrate
0%
b) Acetyl chloride
0%
c) Methyl chloride
0%
d) Trichloro acetic acid
Explanation
FeCl3 (anhyd.) is used as catalyst for following reaction CH3COOH + 3Cl2 → CCl3COOH + 3HCl Answer : (d)
Q.29
The conversion of CH3OH into CH3COOH can be brought about by the following reagents
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a) KMnO4
0%
b) CO + Rh
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c) K2Cr2O7 / H+
0%
d) H3PO4
Explanation
Answer : (b)
Q.30
In preparation of an ester the commonly used dehydrating agent is ... .. [ KCET 1992]
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a) phosphorus pentoxide
0%
b) anhydrous calcium chloride
0%
c) anhydrous aluminium chloride
0%
d) concentrated sulphuric acid
Explanation
H2SO4 acts as protonating (catalyst) agent as well as dehydrating agent Answer : (d)
0 h : 0 m : 1 s
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