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NEET Chemistry MCQ
Aldehydes, Ketones Mcq Neet Chemistry
Quiz 3
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Q.1
Ethanal reacts with alkali to give 3-hydroxybutanal. This reaction is
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a) Aldol condensation
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b) Reimer-Tiemann reaction
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c) Claisen condensation
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d) Polymerisation
Explanation
Answer : (a)
Q.2
Ethane can be obtained from ethanal in one step b
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a) Na-Hg + water
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b) LiAlH4 + ether
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c) aluminium isopropoxide and isopropyl alcohol
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d) Zn-Hg + conc. HCl
Explanation
Clemmensen's reduction Answer : (d)
Q.3
Reduction of >C=O to CH can be carried out with ... .... [ DEC 2000 ]
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a) Catalytic reduction
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b) Na/C2H5OH
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c) NH2NH2/KOH
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d) LiAlH4
Explanation
By Wolff-kishnner reaction Answer : (c)
Q.4
Magenta is
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a) methyl red
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b) red litmus
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c) alkaline phenolphthalein
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d) p-rosaniline hydrochloride
Explanation
Answer : (d)
Q.5
Formaldehyde when reacted with methyl magnesium bromide gives
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a) CH3CHO
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b) CH3COOH
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c) HCHO
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d) C2H5OH
Explanation
Answer : (d)
Q.6
ion Q66) The following reaction is example of
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a) Wagner-Meerwin rearrangement
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b) Wolf rearrangement
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c) Facorskii rearrangement
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d) Steven's rearrangement
Explanation
Answer : (c)
Q.7
Acetophenone when reacted with a base C2H5ONa, yield a stable compound which has the structure
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a)
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b)
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c)
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d)
Explanation
It is condensation reaction Answer : (d)
Q.8
During reduction of carbonyl compounds by H2NNH2 and KOH the first intermediate is
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a) RC=N
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b) RCH=NNH2
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c) RCH≡NH
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d) RCONH2
Explanation
Answer : (b)
Q.9
The product formed by the reaction of chlorine with benzaldehyde in the absence of a catalyst is ... ..[ Tamil Nadu CET 2002]
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a) Chlorobenzne
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b) Benzyl chloride
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c) Benzoyl chloride
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d) o- Chlronenzaldehyde
Explanation
Answer : (c)
Q.10
Aldehydes are produced in atmosphere by
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a) Oxidation of secondary alcohols
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b) Reduction of alkenes
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c) Reduction of oxygen atoms with hydrocarbons
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d) Reaction of oxygen atoms with ozone
Explanation
Answer : (c)
Q.11
CH3CHO + H2NOH → CH3-CH=N-OH . The above reaction occurs at .... ... [ IIT 1997]
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a) pH = 1
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b) pH = 3.5
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c) Any value of pH
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d) pH = 12
Explanation
Carbonyl compounds react with ammonia derivatives in slightly acidic conditions i.e. pH = 3 - 4 Answer : (b)
Q.12
Hexamethylene tetramine is used as an
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a) antipyretic
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b) urinary antiseptic
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c) analgesic
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d) all of these
Explanation
Answer : (b)
Q.13
Both acetaldehyde and ketone react with
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a) rochelle salt
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b) 2,4-dintro phenylhydrazine
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c) ammonical AgNO3
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d) all of the above
Explanation
A characteristic test for carbonyl group, red salt is formed Answer : (b)
Q.14
ion Q74) The major organic product formed from the following reaction
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a)
0%
b)
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c)
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d)
Explanation
Answer : (a)
Q.15
ion Q75) What is X in the equation below
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a) K2Cr2O7/H+
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b) NaBH4
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c) H2/Ni
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d) Both a and b
Explanation
NaBH4 is used for selective reduction of a carbonyl group in a molecule that contains booth C=C and C=O bonds as it does not reduce isolated C=C bonds Answer : (b)
Q.16
Than One Correct Answer Q76) Which show(s) nucleophilic addition reaction(s)
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a) Methanal
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b) Ethanal
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c) Propanone
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d) None of these
Explanation
Answer : (a, b, c)
Q.17
From which of the following, tertiary butyl alcohol is obtained, by the action of methyl magnesium iodide? ... ... [ MP CET 2000 ]
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a) HCHO
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b) CO2
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c) CH3COCH3
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d) CH3CHO
Explanation
Answer : (c)
Q.18
ion Q78)
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a)
0%
b)
0%
c)
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d)
Explanation
Answer : (d)
Q.19
When calcium benzoate and calcium formate are heated they form
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a) acetophenone
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b) benzaldehyde
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c) benzophenone
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d) formaldehyde
Explanation
Answer : (c)
Q.20
When vapour of acetic acid are passed over .... at 300°C we get acetone
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a) Al2O3
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b) CuO
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c) MoO
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d) Cu
Explanation
Answer : (a)
Q.21
Alkaline hydrolysis R2C.Cl2 forms
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a) alkanal
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b) alkanone
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c) propane
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d) propanone
Explanation
Answer : (b)
Q.22
Fehling's solution is
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a) acidified copper sulphate solution
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b) ammoniacal cuprous chloride solution
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c) copper sulphate, Richelle salt + NaOH
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d) none of the above
Explanation
solution produces CuO in it Answer : (c)
Q.23
Than One Correct Answer Q83) Which of the following would not undergo aldol condensation?
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a) CCl3CHO
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b) HCHO
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c) CH3CHO
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d) (CH3)3CCHO
Explanation
Answer : (a,b,d)
Q.24
Than One Correct Answer Q84) Which statement(s) is /are correct in the case of acetaldehyde and acetone?
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a) Both can be reduced into alcohols
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b) Both react with NaOH to form polymer
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c) Both give iodoforms test
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d) Both react with HCN
Explanation
Answer : (a,c,d)
Q.25
Assertion: Cannizzaro's reaction is a disproportion reaction Reason: One molecule of aldehyde is oxidised on the cost of other
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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.26
The order of susceptibility of nucleophilic attach on aldehydes follos the order ... ..[ DCE 2002]
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a) 2° > 3° > 1°
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b) 3° > 2° > 1°
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c) 1° > 2° > 3°
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d) 1° > 3° > 2°
Explanation
Electron releasing effect of +R group decreases the electrophilicity Answer : (c)
Q.27
Assertion: Salicylaldehyde is less soluble in water than p-hydroxy benzaldehyde Reason: The former shows intermolecular H-bonding
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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 : (c)
Q.28
Which one of the following pairs is not correctly matched?
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a)
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b)
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c)
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d)
Explanation
Wolff Kishner reduction is for reduction of aldehydes and ketones to alkanes Answer : (b)
Q.29
Oxidation of Butan-2-one can be achived by ....
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a) Tollen's reagent
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b) Atmospheric oxidation
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c) Br2 water
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d) Conc. HNO3
Explanation
Ketone are oxidised by strong oxidising agent Answer : (d)
Q.30
Which of the follwoing compounds will show positive silver mirror test?
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a) HCOOH
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b) CH3(CHOH)3CHO
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c) CH3COCHOCH3
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d) All
Explanation
All aldehydes, formic acid give this test. α-hydroxy ketone also give this test because of H-CO- group presence Answer : (d)
0 h : 0 m : 1 s
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