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NEET Chemistry MCQ
Aldehydes, Ketones Mcq Neet Chemistry
Quiz 10
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Q.1
When an aldehyde was heated with alkali, a part of it was conveted into alcohol and a part of itto an acid. The aldehyde is
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a) an aromatic aldehyde or HCHO
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b) an aromatic aldehyde other than salicylaldehyde
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c) an aliphatic aldehyde other than HCHO
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d) an aliphatic aldehyde or salicylaldehyde
Explanation
Answer : (a)
Q.2
on Q272) Identify Z in the series
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a) CHCl2.CO.O.COCH3
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b) CH3.CO.CH2COONa
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c) CH2Cl.CO.O.COCH3
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d) (CH3CO)2O
Explanation
X : CH3COOH Y: CH3COCl Z : (CH3CO)2O Answer : (d)
Q.3
Which of the following reaction cannot be used for the reduction of R2CO → R2CH2 [ Roorke 1993]
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a) Clemmensen reduction
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b) Wolff-Kishner reduction
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c) Wurtz reaction
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d) HI/ red P at 200°C
Explanation
Wurtz reaction is usded for alkyl halid Answer : (c)
Q.4
on More Than One Correct Answer Q274) The reaction give below is carried out by
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a) P + HI
0%
b) NaBH4
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c) Wolff-Kishner reduction
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d) Clemmensen reduction
Explanation
Answer : (a,c,d)
Q.5
At room temperature formaldehyde is
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a) Solid
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b) Liquid
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c) Gas
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d) None of the above
Explanation
Formaldehyde is exceptionally gas at room temperature whereas other members of aldehydes and ketones are liquid at room temperature Answer : (c)
Q.6
Which gives a ketone with Grignard reagent?
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a) Methyl cyanide
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b) Formaldehyde
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c) Ethyl alcohol
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d) Methyl iodide
Explanation
Answer : (a)
Q.7
han One Correct Answers Q277) Which is/are less acidic than phenol?
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a) H2O
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b) o-nitrophenol
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c) CH3OH
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d) o-cresol
Explanation
Answer : (a,c,d)
Q.8
Benzaldehyde reacts with methyl amine to give
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a) C6H5CONH2
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b) C6H5CH=NCH3
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c) C6H5NH2
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d) C6H5CH2NH2
Explanation
C6H5CHO + NH2CH3 → C6H5CH=NCH3 + H2O Answer : (b)
Q.9
Ethanol vapours are passed over heated copper at 300°C and product is treated with aqueous NaOH. The final product is
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a) aldol
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b) β-hydroxy butyraldehyde
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c) both a and b
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d) none of the above
Explanation
Answer : (c)
Q.10
han One Correct Answer Q280) Benzaldehyde react(s) with conc. NaOH to give
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a) benzyl alcohol
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b) phenol
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c) sodium benzoate
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d) none of these
Explanation
Answer : (a,c)
Q.11
Which of the following will be most readily dehydrated in acidic conditions? [IIT 2000]
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a)
0%
b)
0%
c)
0%
d)
Explanation
β-hydroxy ketones or aldol readiy dehydration due to the presence of active methylene group Answer : (a)
Q.12
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) reaction of oxygen atoms with hydrocarbons
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d) reaction of oxygen atom with O3
Explanation
Hydrocarbons are oxidised to aldehydes because only these two are present in atmosphere Answer : (c)
Q.13
Aldol condensation of aldehyde and ketones takes place through the formation of
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a) free radical
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b) nucleophile
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c) electrophile
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d) carbne
Explanation
Answer : (b)
Q.14
Which of the following compounds gives a ketone with Grignard's reagent?
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a) Methyl iodide
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b) Formaldehyde
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c) Ethyl alcohol
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d) Ethane nitrile
Explanation
Answer : (d)
Q.15
If acetyl chloride is reduced in the presence of BaSO4, S and Pd, then
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a) CH3COCH3 is formed
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b) CH3CHO is formed
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c) CH3COOH is formed
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d) CH3CH2OH is formed
Explanation
Rosenmund's reaction Answer : (b)
Q.16
han One Correct Answer Q286) Which statement(s) is /are correct in the case of acetaldehyde and acetone?
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a) Both react with hydrazine
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b) Both react with NaHSO4
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c) Both react with hydroxylamine
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d) None of the above
Explanation
Answer : (a,b,c)
Q.17
Oxidation of toluene to benzaldehyde by use of chromyl chloride is called ... ...[ karnataka CET 1997]
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a) Wurts reaction
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b) Etard's reaction
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c) Fitting reaction
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d) Rosenmund's reaction
Explanation
Etard's reaction is Answer : (b)
Q.18
The molecular formula of chlorinated acetone produced in the distillation with bleaching powder is
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a) CCl3COCl3
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b) CH2ClCOOH
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c) CH3COCl
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d) CCl3COCH3
Explanation
CH3COCH3 + Cl2 → CCl3COCH3; chlorine attacks α H-atoms of carbonyl compound Answer : (d)
Q.19
cetal is produced by reacting alcohol in the presence of dry HCl with ... .... [ MP PET 1996]
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a) Ketone
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b) Carboxylic acid
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c) Acetaldehyde
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d) Ether
Explanation
Answer : (c)
Q.20
Cannizzaro reaction is not given by ... ..[ Punjab CET 1996]
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a) Acetaldehyde
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b) Formaldehyde
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c) Trimetyl acetaldehyde
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d) Benzaldehyde
Explanation
Cannizzaro reaction is given by aldehydes not having any α-hydrogen Answer : (a)
Q.21
Which of the following gives aldol condensation reaction?
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a) C6H5OH
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b) C6H2-CO-C6H5
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c) CH3CH2-CO-CH3
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d) (CH3)3-COH
Explanation
Carbonyl compounds containing α-hydrogen atom give aldol condensation Answer : (c)
Q.22
on Q292) Identify X
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a) CH3C(OH)(CH3)2
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b) CH3CH2OH
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c) CH3OH
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d) CH3CHOHCH3
Explanation
Tertiary alcohol is obtained by ketone and Grignard reagents Answer : (a)
Q.23
han One Correct Answer Q293) Ethane can be prepared from ethanal in one step by the use of
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a) zinc amalgam and conc. HCl
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b) amalgamated zinc and hydrochloric acid ) or red P and HI)
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c) lithium aluminium hydride in ether
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d) none of the above
Explanation
Answer : (a,b)
Q.24
The IUPAC name of crotonaldehyde is
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a) propenal
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b) but-2-en-1-al
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c) butan-2-en-al
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d) none of these
Explanation
Crotonaldehyde is CH3.CH = CH.CHO Answer : (b)
Q.25
Acetone is prepared by
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a) Oxidation of n-propyl alcohol
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b) Pyrolysis of calcium acetate as well as acetic acid
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c) Pyrolysis of calcium acetate
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d) Oxidation of acetaldehyde
Explanation
Pyrolysis of calcium acetate as well as acetic acid both yield acetone Answer : (b)
Q.26
on Q296) In the following reaction sequence, the correct structures of E, F and G are
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a)
0%
b)
0%
c)
0%
d)
Explanation
Answer : (c)
Q.27
han One Correct Answers Q297) With reference to the scheme given, which of the given state(s) about T, U, V and W is(are correct? [ IIT 2012]
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a) T is soluble in hot aqeuous NaoH
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b) U is optically active
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c) Molecular formula of W is C10H18O4
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d) V gives effervescence on treatment with aqueous NaHCO3
Explanation
Answer : (a,c,d)
Q.28
Which of the following statements regarding chemical properties of acetophenone are wrong? It is reduced to methyl phenyl carbinol by sodium and ethanol It is oxidised to benzoic acid with acidified KMnO4 It does not undergo electrophilic substitution like nitration at meta-position It does not undergo iodoform reaction with iodine and alkali ... ... [ Tamil Nadu CET 2001]
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a) 1 and 2
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b) 2 and 4
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c) 3 and 4
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d) 1 and 2
Explanation
Acetophenone undergoes usual electrophilic substitution reaction and also gives positive iodoform test with iodine and alkali Answer : (c)
Q.29
Which of the following reactions is used for detecting presence of carbonyl group?
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a) Reaction with phenyl hydrazine
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b) Reaction with hydrazine
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c) Reaction with hydroxylamine
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d) All
Explanation
Carbonyl compounds form oxime with hydroxyl amine, hydrazone with hydrazine and phenyl hydrozone with phenyl hydrazine Answer : (d)
Q.30
on Q300)
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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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