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NEET Chemistry MCQ
Aldehydes, Ketones Mcq Neet Chemistry
Quiz 7
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Q.1
Chromyl chloride and toluene react to produce
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a) p-chlorotoluene
0%
b) Benzoic acid
0%
c) Benzaldehyde
0%
d) Benzyl chloride
Explanation
Answer : (c)
Q.2
The term hypnone is used for
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a) acetaldehyde
0%
b) acetophenone
0%
c) benzophenone
0%
d) none of these
Explanation
Acetophenone is hypnotic agent and called hypnone is medicinal use Answer : (b)
Q.3
Reaction of cyclohexanone with dimethylamine in the presence of catalytic amount of an acid forms a compound if water during the generally known as .... ... [ AIEEE 2005]
0%
a) A Schiff's base
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b) An enamine
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c) An imine
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d) An amine
Explanation
Answer : (b)
Q.4
Calcium acetate when dry distilled gives
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a) Acetaldehyde
0%
b) Acetic anhydride
0%
c) Formaldehyde
0%
d) Acetone
Explanation
Answer : (d)
Q.5
han One Correct Answer Q185) Cannizzaro's reaction will be give by
0%
a)
0%
b)
0%
c)
0%
d) CCl3CHO
Explanation
Answer : (b,c,d)
Q.6
Which of the following does not undergo polymerization
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a) HCHO
0%
b) CH3CHO
0%
c) CH3COCH3
0%
d) None of these
Explanation
Ketone shows condensation only Answer : (c)
Q.7
han One Correct Answers Q187) The new carbon-carbon bond(s) formation is/are possible in
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a) Clemmensen reduction
0%
b) Reimer-Tiemman reaction
0%
c) Friedel-Craft's alkyalation
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d) Cannizzaro's reaction
Explanation
Answer : (b,c)
Q.8
RCH = O + H2 → RCH2OH. For this reaction catalyst is
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a) Pd only
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b) Pt only
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c) Ni only
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d) Any of the above
Explanation
Reduction of aldehydes to alcohol be done with any of the given metallic catalyst Answer : (d)
Q.9
Aldol condensation will not occur in
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a) HCHO
0%
b) CH3CH2CHO
0%
c) CH3CHO
0%
d) CH3CH(OH)CH3
Explanation
Aldol condensation is given by compounds containing α-hydrogen Answer : (a)
Q.10
Ketones can be prepared by
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a) Rosenmund's reduction
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b) Stephen's reduction
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c) both (a) and (b)
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d) none of the above
Explanation
both (a) and (b) are used prepare Aldehyde The Rosenmund reduction is a hydrogenation process in which an acyl chloride is selectively reduced to an aldehyde This reaction involves the preparation of aldehydes (R-CHO) from nitriles (R-CN) using tin(II) chloride (SnCl2), hydrochloric acid (HCl) and quenching the resulting iminium salt ([R-CH=NH2]+Cl-) with water (H2O) Answer : (d)
Q.11
The enol form of acetone, after treatment with D2O gives ... .. [ IIT 1999]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Enol form of acetone on reaction with D2O undergoes deuteration i.e. addition of D2O and dehydration (removal of H2O). The process keeps on repeating untile it ultimately gives Answer : (b)
Q.12
Aldehydes can be conveniently separated from alcohols by treating with
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a) NaCN
0%
b) NaHSO3
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c) Na2SO4
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d) Schiff's reagent
Explanation
Answer : (b)
Q.13
An organic compound C5H10O forms phenyl bydrozone, gives positive iodoform test and undergoes Wolff-Kishner's reaction to give isopentane. It is
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a) pentan-2-one
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b) pentan-3-one
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c) pentanol
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d) 3-methylbutan-2-one
Explanation
It forms hydrazone thus, carbonyl compound; gives +ve iodoform test thus has CH3-CO- or CH3CHOH- unit. Wolff-Kishner's reaction to form isobutane thus, compound is 3-methyl butan-2-one Answer : (d)
Q.14
A compound A has a molecular formula C2Cl3OH. It reduces Fehling solution and on oxidation produces a monocarboxylic acid B. A can laso be obtained by the action of Cl2 on ethanol. A is
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a) CHCl3
0%
b) CH3Cl
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c) Chloral hydrate
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d) Chloroacetic acid
Explanation
Answer : (c)
Q.15
Which of the following reagent is Clemmensen's reduction? [ DEC 2005]
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a) Zn-Hg/conc. HCl
0%
b) Zn/HCl
0%
c) Red P/HI
0%
d) Zn/NaOH
Explanation
In Clemmensen reduction aldehydes or ketones are reduced to the correspondin hydrocarbon Answer : (a)
Q.16
han One Correct Answer Q196) Which of the following reagents react in same manner with HCHO, CH3CHO and CH3COCH3?
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a) HCN
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b) NH2OH
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c) C6H5NHNH2
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d) NH3
Explanation
Answer : (a,b,c)
Q.17
Which of the following aldehydes is more reactive towards nucleophilic addition reaction? ... ...[ Haryana CEET 1998]
0%
a) CCl3CHO
0%
b) CH3CHO
0%
c) C2H5CHO
0%
d) CH3COCH3
Explanation
Presence of electron withdrawing substituent makes the carbonyl carbon more electron defificent and hence increases the reactivity towards nucleophic addition reaction Answer : (a)
Q.18
Which is mixed ketone?
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a) Benzophenone
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b) Acetophenone
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c) Pentanone
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d) All of these
Explanation
Acetophenone is an alkylaryl ketone Answer : (b)
Q.19
In Cannizzaro reaction given below, 2Ph-CHO + OH- → Ph-CH2OH + PhCO2- the slowest step is ... ... [ IIT 1996]
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a) The attack of -OH at the carbonyl group
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b) The transfer of hydride ion to the carbonyl group
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c) The abstraction pf proton from the carbonyl group
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d) The abstraction of proton from the carboxylic acid
Explanation
Answer : (b)
Q.20
Which of the following reactants in presence of AlCl3 give acetophenone? ... ... [ Punjab CET 1994]
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a) Benzene and Acetone
0%
b) Phenol and Acetone
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c) Phenol and AcOH
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d) Benzene and AcCl
Explanation
Answer : (d)
Q.21
Which of the following react with NaOH to produce an acid and an alcohol?
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a) CH3COOH
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b) C6H5COOH
0%
c) HCHO
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d) CH3CH2COOH
Explanation
HCHO undergoes Cannizzaro reaction with NaOH to produce an acid and an alcohol 2NCHO + NaOH → CH3OH + HCOONa Answer : (c)
Q.22
Which of the following reaction is a condensation reaction?
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a) CH2=CH2 → Polyethylene
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b) HCHO → para-formaldehyde
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c) CH3COCH3 → mesityl oxide
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d) CH3CHO → paraldehyde
Explanation
Except option 'c' rest of the reactions are polymerization Answer : (c)
Q.23
han One Correct Answer Q203) When dry calcium formate is heated, it give(s)
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a) CaCO3
0%
b) CaHCO3
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c) H2
0%
d) CH2O
Explanation
Answer : (a,d)
Q.24
on Q204) Identify X in the sequence
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a) (CH3)2CHCHO
0%
b) CH3CH2CH2CH2OH
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c) CH3CH2CH2CHO
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d)
Explanation
C5H12O must be a tertiary alcohol as it gives alkene on treatment with Cu. Thus C4H8O is ketone Answer : (d)
Q.25
han One Correct Answer Q205) Which can show tautomerism?
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a) CH3CH2NO2
0%
b) HCN
0%
c)
0%
d)
Explanation
Answer : (a,b,c,d)
Q.26
3HCHO(aq) ⇋ X, X is ... .... [ DCE 2006]
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a) Formalin
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b) Paraformaldehyde
0%
c) Paraldehyde
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d) Metaformaldehyde
Explanation
Answer : (d)
Q.27
Assertion: Acetophenone and benzophenone can be bistinguished by iodoform test. Reason: Acetophenone and benzophenone both are carbonyl compounds
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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.28
Concentrated sodium hydroxide and benzaldehyde react to produce
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a) Hydrobenzamide
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b) Benzophenone
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c) Cinnamic acid
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d) Benzyl alcohol
Explanation
Answer : (d)
Q.29
With hot conc. KOH brown black resinous product is given by
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a) HCHO
0%
b) CH3CHO
0%
c) C2H5OH
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d) CH3COCH3
Explanation
Answer : (b)
Q.30
Which of the following statement about bezaldehyde is not true
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a) Forms an addition compound with sodium hydrogen sulphate
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b) Undergoes Aldol condensation
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c) Reduces Tollen's reagent
0%
d) Undergoes Cannizzaro's reaction
Explanation
Benzaldehyde does not have any α-hydrogen thus does not undergo aldol condensation Answer : (b)
0 h : 0 m : 1 s
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