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NEET Chemistry MCQ
Carboxylic Acids And Their Derivatives Mcq Neet Chemistry
Quiz 5
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Q.1
Two moles of acetic acid are heated with P2Othe product formed is ... .[ Punjab CET 1991]
0%
a) 2 moles of ethyl alcohol
0%
b) Formic anhydride
0%
c) acetic anhydride
0%
d) 2 mole of methyl cyanide
Explanation
Answer : (c)
Q.2
The correct order of increasing acid stregth of the compounds ... ..[ IIT 2006] (A) CH3CO2H (B) MeOCH2CO2H (B) CF3CO2H (D) (Me)2 - CO2H
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a) B < D < A < C
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b) D < A < C < B
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c) D < A < B < C
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d) A < D < C < B
Explanation
Electron withdrawing groups increase the acidic stregth whereas electron releasing groups decrease the acidic stregth of carboxylic acids. Hence order of acidic stregth of given compounds is as per option "c" Answer : (c)
Q.3
A new carbon-carbon bond is formed in .... ... [ IIT 1998]
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a) Cannizzaro's reaction
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b) Friedel-Crafts reaction
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c) Clemmensen reduction
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d) none of the above
Explanation
Answer : (b)
Q.4
From the following values of dissociation constant of four acids which value represents the strongest acid??
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a) 2 × 10-2
0%
b) 0.02 ×10-1
0%
c) 3 × 10-4
0%
d) 2 × 10-4
Explanation
Larger the value of dissociation constant (Ka), stronger is the acid Answer : (a)
Q.5
on Q126) Consider the following reaction The product 'A' is
0%
a) C6H5OH
0%
b) C6H5Cl
0%
c) C6H5CHO
0%
d) C6H5COCH3
Explanation
It is Rosenmun's reaction ( reduction) Answer : (c)
Q.6
X is heated with sodalime and gives ethane. X is
0%
a) Methanoic acid
0%
b) Ethanoic acid
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c) Propanoic acid
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d) Either a and b
Explanation
CH3CH2COOH +NaOH + CaO → CH3CH3 Answer : (c)
Q.7
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 ... ...[ AIEEE 2009]
0%
a) CH3OH
0%
b) HCHO
0%
c) CH3COCH3
0%
d) CH3COOH
Explanation
Since the compound formed has a fruity smell, it is an ester, thus the liquid to which ethanol and conc. H2SO4 are added must be an acid CH3COOH + C2H5OH → CH3COOC2H5 + H2O Answer : (d)
Q.8
Acetic acid is obtained when
0%
a) Methyl alcohol is oxidised with potassium permanganate
0%
b) Calcium acetate is distilled in the presence of calcium formate
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c) Glycerol is heated with sulphuric acid
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d) Acetaldehyde is oxidised with potassium dichromate and sulphuric acid
Explanation
Answer : (d)
Q.9
In a reaction involving ring substitution of C6H5Y, the major product is meta isomer. The group Y can be
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a) -Cl
0%
b) - COOH
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c) -NH2
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d) -CH3
Explanation
-COOH is m-directing and electron withdrawing group Answer : (b)
Q.10
In presence of posphorus catalyst, chlorine reacts with acetic acid to form
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a) CH3CCl2OH
0%
b) CH3COCl
0%
c) ClCH2COOH
0%
d) CH3COOH
Explanation
Halogen attacks α-carbon atom of acid in presence of P or I2 Answer : (c)
Q.11
Which of the following acids on heating loses a molecule of H2O to form an α, β-unsaturated acid? ... ...[ IIT 1997]
0%
a) CH3CHOOHCOOH
0%
b) HOCH2COOH
0%
c) CH3CHOHCH2COOH
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d) HOCH2CH2CH2COOH
Explanation
β Hydroxy carboxylic acid readily loses a molecule of water on heating to yield α, β-unsaturated acid Answer : (c)
Q.12
Vinegar obtained from sugarcane is
0%
a) HCOOH
0%
b) CH3COOH
0%
c) CH3CH2COOH
0%
d) C6H5COOH
Explanation
Answer : (b)
Q.13
Melting points are normally the higest for
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a) Primary amides
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b) Amines
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c) Secondary
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d) Tertiary amides
Explanation
Primary amides form hydrogen bonding to the maximum extent thus have highest melting point Answer : (a)
Q.14
on Q135) Identify the product C in the series ... ...[ MPCET 1999 ]
0%
a) CH3CHO
0%
b) CH3CH2NHOH
0%
c) CH3COOH
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d) CH3CONH2
Explanation
Answer : (c)
Q.15
R-CH2-CH2OH can be converted in R-CH2CH2COOH. The correct sequence of reacgent is
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a) PBr3, KCN, H+
0%
b) PBr3, KCN, H2
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c) KCN, H+
0%
d) HCN, PBr3, H+
Explanation
Answer : (a)
Q.16
Ethyl alcohol reacts with acetyl chloride to form
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a) Ethyl chloride
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b) Acetic acid
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c) Methyl acetate
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d) Ethyl acetate
Explanation
Answer : (d)
Q.17
A distinctive and chracteristic functional group in fat is
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a) ester group
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b) basic group
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c) keto group
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d) none of these
Explanation
Answer : (a)
Q.18
Acetic anhydride is obtained from acetyl chloride by the reaction of
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a) H2SO4
0%
b) CH3COCH3
0%
c) P2O5
0%
d) CH3COONa
Explanation
CH3COCl + NaOOCCH3 → (CH3)2O + NaCl Answer : (d)
Q.19
Which of the following compounds on boiling with KMnO4 (alk.) and subsequent acidification will not give benzoic acid? .... [ KCET 2002]
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a) Benzyl alcohol
0%
b) Acetophenone
0%
c) Anisole
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d) Toluene
Explanation
Anisole C6H5OCH3 is not oxidised by KMnO4 to benzoic acid Answer : (c)
Q.20
ion :Acetate ion is more basic than formate ion Reason : The +IE methyl group in acetate ion intensifies electron density on oxygen atom
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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 : (a)
Q.21
The acid formed when propyl magnesium bromide is treated with CO2is
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a) C3H7COOH
0%
b) C2H5COOH
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c) both a and b
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d) none of these
Explanation
Answer : (a)
Q.22
Ethylalcohol on oxidation with K2Cr2O7 gives
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a) Acetic acid
0%
b) Formic acid
0%
c) Formaldehyde
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d) Acetaldehyde
Explanation
Answer : (a)
Q.23
What will happen if LiAlH4 is added to an ester?
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a) Two units of alcohol are obtained
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b) Two units of acid are obtained
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c) One unit of alcohol and one unit of acid is obtained
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d) none of these
Explanation
Answer : (a)
Q.24
Which will not give acetamide on reaction with ammonia?
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a) Acetic acid
0%
b) Methyl propionate
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c) Acetyl chloride
0%
d) Acetic anhydride
Explanation
Methyl propionate will give propanamide on reaction with ammonia Answer : (b)
Q.25
If acetyl chloride is reduced in the presence of BaSO4 and Pd
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a) CH3CH2OH is formed
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b) CH3COCH3 is formed
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c) CH3CHO is formed
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d) CH3COOH is formed
Explanation
Answer : (c)
Q.26
on Q147) In the above reaction, product P is
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a)
0%
b) C6H5 - CO - C6H5
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c)
0%
d)
Explanation
Answer : (a)
Q.27
Formic acid cannot be halogenated with chlorine in presence of red P, but acetic acid can be halogenated in the same way, because
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a) formic acid has no α-H-atom in its molecule
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b) formic acid is weaker than acetic acid
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c) both a and b
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d) none of the above
Explanation
Clorine attack α -carbon atom in carboxylic acids Answer : (a)
Q.28
Identify the correct order of boiling points of the following compounds I. CH3CH2CH2CH2OH II. CH3CJ2CH2CHO III. CH3CH2CH2COOH
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a) I > II > III
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b) III > I > II
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c) I > III > II
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d) III > II > I
Explanation
Order of boiling points of given compounds is given on the basis of extent of hydrogen bonding. Thus order of boiling point is as per option "b" Answer : (b)
Q.29
Acid present in tomatoes is
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a) Oxalic acid
0%
b) tartaric acid
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c) Lactic acid
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d) Citric acid
Explanation
Answer : (a)
Q.30
on Q151) In the reaction the intermediate 'X' is
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a) benzoic acid
0%
b) o-xylene
0%
c) phthalic anhydride
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d) phthalic acid
Explanation
Answer : (c)
0 h : 0 m : 1 s
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