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NEET Chemistry MCQ
Aldehydes, Ketones Mcq Neet Chemistry
Quiz 2
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Q.1
When a ketone is condensed into an aldol, the reagent used is
0%
a) alkali
0%
b) NaHCO3
0%
c) Br2 water
0%
d) Cl2
Explanation
Alkali used is Ba(OH)2 Answer : (a)
Q.2
Which does not react with Fehling solution?
0%
a) Acetaldehyde
0%
b) Propanone
0%
c) Glucose
0%
d) Formic acid
Explanation
Ketones do not react with Fehling's solution Answer : (b)
Q.3
(CH3)2C = CHCOCH3 can be oxidised to (CH3)2C = CHCOOH by
0%
a) NaOI
0%
b) KMnO4
0%
c) Cu at 300°C
0%
d) chromic acid
Explanation
Unsaturated ketones may be converted to unsaturated acids by sodium hypohalite i.e. NaOCl, NaOI etc. Answer : (a)
Q.4
ion Q32) What is compound (C) is reaction below
0%
a) α-amino acid
0%
b) α-amino alkanol
0%
c) α-hydroxy acid
0%
d) α-amino β-hydroxy acid
Explanation
Answer : (a)
Q.5
ion Q33) The end product in the following sequence of reaction is ... [ Bihar CEE 2002]
0%
a) acetic acid
0%
b) iso-propyl alcohol
0%
c) acetone
0%
d) ethanol
Explanation
A: CH3CHO B: CH3CH(OH) -CH3 C: acetone Answer : (c)
Q.6
The structural formula of the compound isomeric with acetone is
0%
a) CH3CHO
0%
b) CH3CH2OH
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c) CH3CH2CHO
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d) none of these
Explanation
Acetone (CH3COCH3) and propanal (CH3CH2CHO) have same molecular formula C3H6O and are functional isomers Answer : (c)
Q.7
Wolff-Kishner reduction is used for the reduction of
0%
a) Olefins
0%
b) Carboxylic acid
0%
c) Carbonyl compounds
0%
d) Nitro compounds
Explanation
Answer : (c)
Q.8
Which is obtained by oxidation of propionaldehyde?
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a) Acetic acid and formic acid
0%
b) Acetic acid
0%
c) n-propyl alcohol
0%
d) propanoic acid
Explanation
Answer : (d)
Q.9
Acetaldehyde cannot exhibit
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a) Tollen's test
0%
b) Benedict's test
0%
c) Lucas test
0%
d) Iodoform test
Explanation
Lucas test is given by alcohol Answer : (c)
Q.10
The compound obtained by the reduction of propionaldehyde by amalgamated zinc and concentrated HCl is
0%
a) Propene
0%
b) Propane
0%
c) Propanol
0%
d) All
Explanation
It is Clemmensen reduction Answer : (b)
Q.11
Trichloroacetaldehyde, CCl3CHO reacts with chlorobenzene in presence of sulphuric acid and produces
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
It is preparation of DDT Answer : (c)
Q.12
Benzyl alcohol is obtained from benzaldehyde by
0%
a) Reduction with LiAlH4
0%
b) Kolbe's reaction
0%
c) Fitting's reaction
0%
d) Clemmensen's reduction
Explanation
Answer : (a)
Q.13
In a Cannizzaro reaction, the intermediate that will be best hydeide donor is ... ... [ IIT 1997]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Presence of electron donating group (-OCH3) facilitates the removal of hydride ion :H- Answer : (c)
Q.14
Tautomerism is not exhibited by
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Essential condition to show keto-enol tsutomerism is the presence of α-hydrogen atom but hydrogen atom bonded to sp2 hybridized C-atom i.e. unsaturated carbon atom, is difficult to ionise thus option 'a' does not show tautomerism Answer : (a)
Q.15
Which of the aldehydes is most reactive? [ DEC 2004]
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a) HCHO
0%
b) CH3CHO
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c) C6H5-CHO
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d) All are equally reactive
Explanation
As the R group ( +I effect) increases, the reactivity of aldehydes decreases. the reactivity of ketone further decreases due to the +I effect of the alkyl (R) group and steric hindrance. HCO > RCHO > R2C= Answer : (a)
Q.16
Than One Correct Answer Q46) Oppenauer oxidation
0%
a) uses aluminium t-butoxide
0%
b) uses aluminium isopropoxide
0%
c) is used to prepare ketone
0%
d) is used to prepare aldehyde
Explanation
Answer : (a,c)
Q.17
Which of the following reagents reacts differntly with HCHO, CH3CHO and CH3COCH3 ... ..[ MPCET 2000 ]
0%
a) HCN
0%
b) NH3
0%
c) NH2NH2
0%
d) NH2OH
Explanation
Answer : (b)
Q.18
ion Q48)
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Since electron withdrawing group is attached to benzene ring electron transfer takes place and thus form keto form Answer : (d)
Q.19
Consider the reaction: RCHO + NH2NH2 → RCH = N - NH2 What sort of reaction is it?
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a) Nucleophilic addition - elimination reaction
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b) Electrophilic addition - elimination reaction
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c) Free radical addition - elimination reaction
0%
d) Electrophilic addition - elimination reaction
Explanation
Answer : (a)
Q.20
Carbonyl group undergoes
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a) electrophilic addition reactions
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b) nucleophilic addition reactions
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c) both a and b
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d) none of the above
Explanation
Answer : (b)
Q.21
Ketones are first oxidation product of
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a) primary alcohols
0%
b) secondary alcohol
0%
c) trihydric alcohol
0%
d) dihydric alcohol
Explanation
Answer : (b)
Q.22
A mixture of calcium acetetae and calcium formate on heating gives
0%
a) HCHO
0%
b) CH3CHO
0%
c) CH3COCH3
0%
d) all of these
Explanation
Answer : (b)
Q.23
Than One Correct Answer Q53) Aldehydes can be reduced to hydrocarbons by
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a) The Huang-Minlon method
0%
b) Mg/Hg, H2O
0%
c) Wolff-Kishner reduction
0%
d) Clemmensen reduction
Explanation
Answer : (a,c,d)
Q.24
The reaction of acetaldehyde with HCN followed by hydrolysis gives a product which exhibits
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a) Tautomerism
0%
b) Geometrical isomerism
0%
c) Metamerism
0%
d) Enantiomerism
Explanation
Answer : (d)
Q.25
ion More Than One Correct Answer Q55) A will
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a) form dioxime
0%
b) give Cannizzaro's reaction
0%
c) give Idoform test
0%
d) reduce Tollen's reagent
Explanation
Answer : (a,b,c,d)
Q.26
Aldehyde and ketones cannot be distinguished by ... ..
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a) Molisch's test
0%
b) Tollen's test
0%
c) Benedict's test
0%
d) Schiff's test
Explanation
Molisch's test is a sensitive chemical test for the presence of carbohydrates Answer : (a)
Q.27
tion: Acetone forms one oxime where as acetophenone forms two oximes. Reason: In acetophenone syn and anti form of geometrical isomers are possible
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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 : (b)
Q.28
Which of the following is incorrect
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a) FeCl3 is used in the dtection of phenols
0%
b) Fehling solution is used in the detection of glucose
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c) Tollen's reagent is used in detecton of unsaturation
0%
d) NaHSO3 is used in the detection of carbonyl compounds
Explanation
Tollen's reagent is used to detect aldehyde group Answer : (c)
Q.29
In which reaction, aromatic aldehyde is treated with acid anhydride in the presence of corresponding salt of the acid to give unsaturated aromatic acid?
0%
a) Perkin's reaction
0%
b) Wurtz reaction
0%
c) Friedel Crafts reaction
0%
d) None of these
Explanation
Perkin's reaction Answer : (a)
Q.30
iso-propyl alcohol on oxidation forms
0%
a) Acetone
0%
b) Ether
0%
c) Ethylene
0%
d) Acetaldehyde
Explanation
Answer : (a )
0 h : 0 m : 1 s
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