MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
NEET
NEET Chemistry MCQ
Aldehydes, Ketones Mcq Neet Chemistry
Quiz 9
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Q.1
on Q241) The following reaction is known by the name of
0%
a) Rosenmund's reaction
0%
b) Cannizzaro's reaction
0%
c) Stephen's reduction
0%
d) none of these
Explanation
Rosenmund's reaction involves reduction of acid chlorides to aldehydes by the action of H2 in presence of Pb/BaSO4 BaSO4 acts as poison for Pd and prevents further reduction of aldehydes to alcohol Answer : (a)
Q.2
Acetone may be produced from starch by the action of
0%
a) acid
0%
b) certain bacteria
0%
c) oxidising agents
0%
d) none of these
Explanation
Answer : (b)
Q.3
Which of the following compounds is oxidised to prepare ethyl methyl ketone? [ IIT 1988]
0%
a) 2-propanol
0%
b) 1-butanol
0%
c) 2-butanol
0%
d) t-butyl alcohol
Explanation
Answer : (c)
Q.4
Ketone reacts with Mg-Hg over water to give
0%
a) Pinacolone
0%
b) Pinacols
0%
c) Alcohols
0%
d) None of these
Explanation
Answer : (b)
Q.5
Which of the following reagents is used to distinguish acetone and acetophenone?
0%
a) NaHSO3
0%
b) Na2SO4
0%
c) NH4Cl
0%
d) Grignard reagent
Explanation
acetophenone being aromatic ketone does not form adduct with NaHCO3 whereas acetone does Answer : (a)
Q.6
Aldehydes behave as
0%
a) Oxidising as well as reducing agent
0%
b) reducing agent
0%
c) oxidising agent
0%
d) dehydrating agent
Explanation
All aldehydes are easily oxidised to respective acids and thus acts as reducing agents Answer : (b)
Q.7
han One Correct Answers Q247) Which is /are generally used for preparing derivatives of aldehydes and ketones?
0%
a) Hydrogen cyanide
0%
b) Hydroxylamine hydrochloride
0%
c) 2,4-Dinitrophenyl hydraine
0%
d) Phenylhydrazinehydrochloride
Explanation
Answer : (b,c,d)
Q.8
A compound possessing α-hydrogen atom, in the presence of dilute alkali forms β-hydroxy aldehyde. This product on cortonaldehyde. The compound us
0%
a) CH3CH2CHO
0%
b) CH2=CH-CHO
0%
c) HC≡C-CHO
0%
d) CH3CHO
Explanation
Answer : (d)
Q.9
Benzaldehyde and acetaldehyde can be distinguished by
0%
a) NH3 reaction
0%
b) iodoform test
0%
c) 2:4 DNP test
0%
d) Wolff-Kishner's reduction
Explanation
Due to presence of CH3-CO- unit gives iodoform test Answer : (b)
Q.10
on Q250) The product of following reaction is
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer : (c)
Q.11
Which of the following has the most acidic hydrogen? [ IIT 2000 ]
0%
a) 3-Hexanone
0%
b) 2, 4-Hexanedione
0%
c) 2, 5-Hexanedione
0%
d) 2, 3-Hexaedione
Explanation
2,4-Hexanedione has active methylene group surrounded by two electron withdrawing groups on both sides hence its hydrogen is most acidic Answer : (b)
Q.12
han One Correct Answer Q252) Which is/are correct statement(s)?
0%
a) Cannizzaro's reaction is proton-hydride transfer reaction
0%
b) Hofmann-degradation of acid amid involves intra-molecular migration is intramolecular
0%
c) Fries migration is intramolecular
0%
d) Cannizzaro's reaction is disproportionation reaction
Explanation
Answer : (a,b,c,d)
Q.13
HCHO and HCOOH are distinguished by treating with
0%
a) Benedict solution
0%
b) NaHCO3
0%
c) Tollens reagent
0%
d) Fehling's solution
Explanation
HCOOH reacts with NaHCO3 giving out effervescences of CO2. Note that HCOOH is also strong reducing agent Answer : (b)
Q.14
Wacker method involves the conversion of alene using PdCl2 into corresponding
0%
a) Alcohol
0%
b) Aldehyde
0%
c) Ether
0%
d) Ketone
Explanation
Answer : (b)
Q.15
How will you convert butan-2-one to propanoic acid? ... ... [ IIT 2005]
0%
a) Tollen's reagent
0%
b) Fehling's solution
0%
c) NaOH/I3/H+
0%
d)NaOH/NaI/H+
Explanation
Butane -2-one can be converted to propanic acid by iosodorm reaction Answer : (c)
Q.16
han One Correct Answer Q256) Which compound(s) react(s) with PCl5?
0%
b) C2H5OH
0%
c) CH3COCH3
0%
a) HCHO
0%
d) CH3CHO
Explanation
Answer : (b,c,d)
Q.17
The addition of HCN to carbonyl compounds is an example of ... ... [ Haryana EET 2000 ]
0%
a) Nucleophilic substitution
0%
b) Electrophilic addition
0%
c) Nucleophilic addition
0%
d) Electrophilic substitution
Explanation
Carbonyl compounds undergo nucleophilic addition reaction Answer : (c)
Q.18
The important step in Cannizzaro's reaction is the intermolecular shift of
0%
a) H-atom
0%
b) proton
0%
c) hydronium ion
0%
d) hydride ion
Explanation
Answer : (d)
Q.19
Nucleophilic addition reaction will be most favoured in
0%
a) CH3CHO
0%
b) CH3CH2CHO
0%
c) (CH3)2C = O
0%
d) CH3CH2CH2COCH3
Explanation
Less +ve inductive effect on carbonyl group and thus more +ve charge on C+ to give nucleophilic addition Answer : (a)
Q.20
Which of the following does not give brick red ppt. with Fehling's solution?
0%
a) Formalin
0%
b) Acetone
0%
c) Acetaldehyde
0%
d) D-glucose
Explanation
Acetone being ketones does no reduce Fehling's solution to give brick red ppt. Answer : (b)
Q.21
Consider the following statements. Acetopgenone can be prepared by I. Oxidation of 1-phenylethanol II. Reaction of benzaldehyde with methyl magnesium bromide III. Friedel crafts reaction of benzene with acetyl chloride IV. Distillation of calcium benzoate Which of the above satements are correct?
0%
a) I and II
0%
b) I and IV
0%
c) I and III
0%
d) III and IV
Explanation
Answer : (c)
Q.22
C6H5CHO + HCN → C6H5CN(CN)OH, the product is
0%
a) optically active
0%
b) raccemate
0%
c) a meso compound
0%
d) mixture of distereoisomers
Explanation
Answer : (b)
Q.23
han One Correct Answer Q263) Which react(s) with Fehling's solution
0%
a) Acetone
0%
b) Formic acid
0%
c) Acetaldehyde
0%
d) Formaldehyde
Explanation
Answer : (b,c,d)
Q.24
Acetals are
0%
a) Aldehyde
0%
b) Ketone
0%
c) diether
0%
d) hydroxy aldehyde
Explanation
Answer : (c)
Q.25
Tear gas is
0%
a) C6H5COCH2Cl
0%
b) C6H5COCH3
0%
c) C6H5COCl
0%
d) C6H5OC6H5
Explanation
Phenacyl chloride is also known as tear gas Answer : (a)
Q.26
Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound E. Compound E on further treatment with aqueous KOH yields compound F. Compound F is .... [ IIT 2007]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer : (a)
Q.27
Dialkyl cadmium reacts with compound to form a ketone. The compound is
0%
a) CO
0%
b) acid chloride
0%
c) acid
0%
d) ester
Explanation
2CH3COCl + R2Cd → 2CH3COR + CdCl2 Answer : (b)
Q.28
Aldehydes and ketones do not give addition reaction with
0%
a) HCN
0%
b) HCl(aq)
0%
c) NaHSO4
0%
d) Both a and b
Explanation
Answer : (b)
Q.29
General formula of carbonyl compound is ...
0%
a) CnH2nP
0%
b) CnH2n+2O
0%
c) CnH2n+1O
0%
d) CnH2n+2P2
Explanation
Answer : (a)
Q.30
C2H5OH and RCOOC2H5 can be separated from CH3CHO using .... ... [ DEC2006]
0%
a) Tollen's reagent
0%
b) I2/NaoH
0%
c) NH2NH2
0%
d) NaHSO3
Explanation
CH3OH reacts with NaHSO3 to form a white addition compound C2H5OH and RCOOC2H5 do not react with NahSO3 Answer : (d)
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page