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NEET Chemistry MCQ
Aldehydes, Ketones Mcq Neet Chemistry
Quiz 4
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Q.1
C2H5CHO and (CH3)2CO can be distinguished by testing with
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a) Phenyl hydrazine
0%
b) Hydroxylamine
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c) Fehling solution
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d) Sodium bisulphite
Explanation
C2H5CHO being aldehyde reduces Fehling's solution to give brick red ppt, whereas (CH3)2CO being ketone does not reduce Fehling's solution Answer : (c)
Q.2
Which will form two oximes with NH2OH?
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a) H2C=O
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b) CH3COCH3
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c) CH3CH2COCH2CH3
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d) CH3CH2COCH3
Explanation
Answer : (d)
Q.3
ion Q93) On vigorous oxidation by permanganate solution gives .... [ AIEEE 2002]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer : (d)
Q.4
ion Q94) Muscone ( an explosive perfume secreted by musk deer) has the structure Its IUPAC name is
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a) methyl cyclopentadecan-3-one
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b) 3-methyl cyclopentadecanone
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c) 3-methyl cyclohexdecan-3-one
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d) 3-methyl cyclotetradecanone
Explanation
Answer : (b)
Q.5
Clemmensen's reduction of ketones is carried out in presence of
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a) Zn-Hg with conc. HCl
0%
b) LiAlH4 in water
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c) Glycol with KNO
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d) H2with Pd catalyst
Explanation
Answer : (a)
Q.6
When sodium formate is heated it gives
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a) water
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b) carbon dioxide
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c) sodium hydroxide
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d) hydrogen
Explanation
Answer : (d)
Q.7
On heating acetaldehyde with ammonical silver nitrate solution, we get
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a) HCHO
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b) Silver acetate
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c) Silver mirror
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d) CH3OH
Explanation
Answer : (c)
Q.8
Which of the following does not react with phenyl hydrazine?
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a) Acetophenone
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b) Acetone
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c) Ethanol
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d) Ethanal
Explanation
Answer : (c)
Q.9
Formula of diacetone alcohol is
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a) (CH3)2C(OH)CH2COCH3
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b) (CH3)2CHOHCH2COCH3
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c) CH3CHOHCH2COCH3
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d) none of the above
Explanation
Answer : (a)
Q.10
Which of the following is hypnotic?
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a) Acetaldehyde
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b) Metaldehyde
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c) Paraldehyde
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d) None
Explanation
Answer : (c)
Q.11
han One Correct Answer Q101) Among the following compounds, which will react with acetone to give a product containing >C=N- ?
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a) C6H5NH2
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b) (CH3)3N
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c) C6H5NHC6
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d) C6NHNH2
Explanation
Answer : (a and d)
Q.12
Which compounds will not reduce Fehling's solution?
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a) Benzaldehyde
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b) Ethanal
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c) Methanal
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d) Trichloroethanal
Explanation
Answer : (a)
Q.13
Chloral belongs to the class of
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a) alcohols
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b) aldehydes
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c) amides
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d) ketones
Explanation
Chloral is CCl3CHO (2,2,2-tricholroethanal) Answer : (b)
Q.14
3-Hydroxybutanal is formed when (X) reacts with (Y) in dilute (Z) solution. What are X, Y and Z
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a) CH3CHO, (CH3)2CO, NaOH
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b) CH2CHO, CH3CHO, NaCl
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c) (CH3)2CO, (CH3)2CO, HCl
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d) CH3CHO, CH3CHO, NaOH
Explanation
Answer : (d)
Q.15
Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid? [ AIEEE 2004]
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a) Phenol
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b) Benzaldehyde
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c) Butanol
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d) Benzoic acid
Explanation
Benzaldehyde will undergo Cannizzaro reaction on treatment with 50% NaOH to produce benzyl alcohol and benzoic acid as it does not contain α-hydrogen Answer : (b)
Q.16
han One Correct Answer Q106) Which compound(s) has have active methylene group?
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a) CH3-CH2-NO2
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b)
0%
c)
0%
d)
Explanation
Answer : (b,c,d)
Q.17
An organic compound X on treatment with acidified K2Cr2O7 gives compound Y which reacts with I2 and sodium carbonate to form triiodomethane. The compound X can be ... ..
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a) CH3CH(OH)CH3
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b) CH3CH2CHO
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c) CH3CHO
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d) CH3COCH3
Explanation
Answer : (a)
Q.18
The best oxidising agent for oxidation of CH3CH=CHCHO to CH3CH=CH-COOH
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a) Acidified KMnO4
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b) Alkaline KMnO4
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c) Acidified K2Cr2O7
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d) Ag(NH3)2+
Explanation
Tollen's reagent oxidises only -CHO to -COOH group Answer : (d)
Q.19
Which of the following compounds does not react with NaHSO3
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a) HCHO
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b) Acetone
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c) Acetophenone
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d) Acetaldehyde
Explanation
Aromatic ketones are less reactive than aliphatic ketones which is turn are less reactive than aldehydes Answer : (c)
Q.20
Acetaldehyde is produced from the following in the presence of aqueous KMnO4 solution ... ..[ Punjab CET 1998]
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a) Ethyl chloride
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b) Methyl alcohol
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c) Ethane
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d) Ethyl alcohol
Explanation
Answer : (d)
Q.21
Alkaline hydrolysis of 1,1-dichloroalkane yields
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a) alkyne
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b) alkanol
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c) alkanal
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d) alkanone
Explanation
Answer : (c)
Q.22
Schiff's reagent is
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a) magenta solution decolourised with sulphurous acid
0%
b) magenta solution decolourised with chlorine
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c) ammoniacal cobalt chloride solution
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d) ammoniacal manganese sulphate solution
Explanation
Answer : (a)
Q.23
han One Correct Answer Q113) Which is/are not mixed ketone(s)?
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a) Butan-2-one
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b) Propan-2-one
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c) Pentan-3-one
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d) Pentan-2-one
Explanation
Answer : (b,c)
Q.24
Collin's reagent causes the conversion
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a) >CO → >CHOH
0%
b) >CHO → -COOH
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c) >CHOH → >CO
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d) >CHOH → -COOH
Explanation
Collin's (CrO3-pyridine) converts 2° alcohol to ketone and 1° alcohol to aldehyde Answer : (c)
Q.25
han One Correct Answer Q115) Which of the following will undergo aldol condensation?
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a) Acetaldehyde
0%
b) Benzaldehyde
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c) Propanaldehyde
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d) Trideutero acetaldehyde
Explanation
Answer : (a,b,d)
Q.26
on Q116) This reaction given is ... ... [ DEC 2002]
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a) Cannizzaro reaction
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b) Aldol candensation
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c) Knoevengel reaction
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d) Non of these
Explanation
Answer : (a)
Q.27
Assertion: Chloral hydrate CCl3CH(OH)2 is a stable molecule. Reason: An organic compound having two -OH groups on one carbon atom is unstable
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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
Paraldehyde is a trimer of
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a) Acetaldehyde
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b) Benzaldehyde
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c) Propionaldehyde
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d) Formaldehyde
Explanation
Answer : (a)
Q.29
Calcium propanoate on refluxing yields
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a) propanol - 2
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b) pentanone-2
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c) propanone-2
0%
d) pentanone-3
Explanation
(CH3CH2COO)2Ca → CH3CH2COCH2CH3 + CaCO3 Answer : (d)
Q.30
Aldehyde used in the manufacture of perfumes is
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a) HCHO
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b) C6H5CHO
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c) CCL3CHO
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d) CH3CHO
Explanation
Benzaldehyde due to bitter almonds odour Answer : (b)
0 h : 0 m : 1 s
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