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NEET Chemistry MCQ
Aldehydes, Ketones Mcq Neet Chemistry
Quiz 5
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Q.1
Which of the following reactions can produce R-CO-Ar?
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a) R + CrO3 →
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b) COCl + RMgX →
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c)
0%
d)
Explanation
It is a Friedel Crafts acylation Answer : (d)
Q.2
Which structural unit is possessed by aldehyde and not ketone?
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a) α-H atom
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b) H-atom and carbonyl group
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c) OH and carbonyl group
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d) None of the above
Explanation
Answer : (b)
Q.3
The IUPAC name of CH3COCH(CH3)2 is .... ... [ AIEEE 2004]
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a) 4-Methyliso-propyl ketone
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b) 3-Methyl-2-butanone
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c) iso-propylmethyl ketone
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d) 2-methyl-3-butanone
Explanation
Answer : (b)
Q.4
Compound (A) C5H10O forms a phenyl hydrazone and gives negative Tollens and iodoform tests. Compound (A) on reduction gives n-pentane. Compound (A) is
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a) a primary alcohol
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b) an aldehyde
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c) a ketone
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d) a secondary alcohol
Explanation
compound A is pentan-3-one Answer : (c)
Q.5
on Q125) Identify the product Y in the sequence
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a) (CH3)2CHOH
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b) CH3CH2OH
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c) CH3OH
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d) CH3CH2OH
Explanation
Answer : (a)
Q.6
Stephen's reaction is reduction of
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a) acyl halide in the presence of Pd/BaSO4
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b) alkyl cyanide with LiAlH4
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c) alkyl cyanide with SnCl2 and HCl
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d) alkyl isocyanide with Na and alcohol
Explanation
Answer : (c)
Q.7
han One Correct Answers Q127) Benzaldehyde in Clemmensen reduction form(s)
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a) methyl benzene
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b) phenyl methane
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c) toluene
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d) none of these
Explanation
Answer : (a,b,c)
Q.8
on Q128) In the given reaction X is
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a) C2H5COOH
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b) CH3COOH
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c) (COOH) - CH=CH-(COOH)
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d) CH3CH = CH - COOH
Explanation
Knoevenagel reaction Answer : (d)
Q.9
on Q129) The correct order of reactivity of PhMgBr with
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a) I > II > III
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b) III > II > I
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c) II > III > I
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d) I > III > II
Explanation
Presence of bulky group around carbonyl group creates steric hindrance for the attack of Grignard reagent. Hence order of reaction is as per option "c" Answer : (c)
Q.10
Formaldehyde is not used in
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a) adhesives
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b) bakelite
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c) tooth powders
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d) explosives
Explanation
Answer : (d)
Q.11
Which of the following will react with water? [ IIT 1998]
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a) CHCl3
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b) Cl3CCHO
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c) CCl4
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d) ClCH2CH2Cl
Explanation
Answer : (b)
Q.12
Which of the following is correct for carbonyl compounds?
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a)
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b)
0%
c)
0%
d)
Explanation
Answer : (b)
Q.13
Treatment of acetaldehyde with ethyl magnesium bromide and subsequently hydrolysis gives
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a) 1-butanol
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b) 2-butanol
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c) 1-propanol
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d) tert-butanol
Explanation
Answer : (b)
Q.14
Propan-2-ol on treatment with copper at 300°C forms
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a) Ethane
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b) Acetone
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c) Acetaldehyde
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d) Both a and b
Explanation
Answer : (b)
Q.15
The compound which does not give aldol condensation is ... .. [ DEC 2005]
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a) CH3CHO
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b) (CH3)3C - CHO
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c) CH3 - CH2 - CHO
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d) CH3COCH3
Explanation
(CH3)3C - CHO does not thave α-hydrogen atom hence it does not give aldol condensation Answer : (b)
Q.16
han One Correct Answer Q136) Which of the following reaction is/are used in the preparation of alcohol?
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a) C2H5Br + KOH(aq) →
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b)
0%
c)
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d)
Explanation
Answer : (a,b,c,d)
Q.17
on Q137) The above reaction is called ... ..[ Haryana CEET 1998]
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a) Perkin's reaction
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b) Reimer-Tiemann reaction
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c) Duff's reaction
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d) Gattermann reaction
Explanation
Answer : (b)
Q.18
on Q138) End product of the following sequence of reaction is
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a) CH2(COOH)2
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b)
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c)
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d)
Explanation
Answer : (a)
Q.19
The reagent used for the separation of acetaldehyde from acetophenone is
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a) NaOH/I2
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b) C6H5NHNH2
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c) NaHSO3
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d) NH2OH
Explanation
Acetaldehyde being aliphatic carbonyl compound forms adduct with NaHSO3 which one heating with dil. mineral acid gives back acetaldehyde whereas acetophenone does not give such reaction Answer : (c)
Q.20
When vapour of iso-propyl alcohol are passed over heated copper, the major product obtained is ... ... [ Punjab CET 1998]
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a) Propylene
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b) Acetone
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c) Propane
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d) Acetyldehyde
Explanation
Secondary alcohols produce ketones on passing over heated copper Answer : (b)
Q.21
Ketones are prepared by
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a) Cannizzaro's reaction
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b) Rosenmund's reduction
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c) Clemmensen's reduction
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d) Oppenauer's oxidation
Explanation
Answer : (d)
Q.22
Acetone when saturated with dry acid gives
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a) diacetone alcohol
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b) mesityl oxide
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c) mesitylene
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d) propane
Explanation
Answer : (b)
Q.23
han One Correct Answer Q143) Which of the following aldehydes undergo(es) aldol condensation?
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a) p-ClC6H4CHO
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b) CH3CHO
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c) C6H5CHO
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d) C6H5CH2CHO
Explanation
Answer : (b,d)
Q.24
Acetaldehyde undergoes self condensation in presence of aluminium ethoxide to give ethyl acetate. This reaction is called
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a) Aldol condensation
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b) Perkin reaction
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c) Tischenko's reaction
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d) Cannizaro's reaction
Explanation
Tischenko's reaction Answer : (c)
Q.25
han One Correct Answer Q145) Which has/ have acidic hydrogen?
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a) CH3C ≡ CH
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b) C6H5COCH2CN
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c) CH3COCH2COCH3
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d) CH3COCH2CN
Explanation
Answer : (a,b,c,d)
Q.26
When ethanal reacts with CH3MgBr and C2H5OH/ dry HCl the product formed are ....
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a) Propane and methyl acetate
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b) 2-propanol and acetal
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c) ethane and hemiacetal
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d) ethyl alcohol and 2-propanol
Explanation
Answer : (b)
Q.27
han One Correct Answers Q147) Which of the following statements is/are correct regarding benzaldehyde?
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a) On reduction it yield phenol
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b) On oxidation it yield benzoic acid
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c) It is used in perfumary
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d) It is known as oil of bitter almonds
Explanation
Answer : (b,c,d)
Q.28
When m-chlorobenzaldehyde is treated with 50% KOH solution, the product(s) obtained is(are)
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a)
0%
b)
0%
c)
0%
d)
Explanation
Answer : (c)
Q.29
Ketones (R1COR2); R1=R2=alkyl group, can be obtained in one step by
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a) Oxidation of primary alcohol
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b) Oxidation of secondary alcohols
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c) Reaction of acid halides and alcohol
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d) Hydrolysis of ester
Explanation
Answer : (b)
Q.30
on Q150) The structure of compound B is
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a)
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b)
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c)
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d)
Explanation
Answer : (d)
0 h : 0 m : 1 s
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