CHAPTER # 12 Aldehydes and ketones MCQs
1. The
carbon atom of a carbonyl group is
a) Sp
hybridized b) Sp2 hybridized
c) Sp3 hybridized d) None of these
2. Aldehydes
can be oxidized by
a) Tollen's reagent b) Fehling solution
c)
Benedict solution d) All.
3. Tollen's
reagent is
a) Ammonical cuprous chloride
b)
Ammonical cuprous oxide
c)
Ammonical silver bromide
d)
Ammonical silver nitrate.
4. Silver
mirror is a test for
a)
Aidehydes b) Thioaleohols
c)
Acids d) Ethers
5. Aldehydes
are produced in atmosphere by
a) Oxidation of secondary alcohols
b) Reducuon of alkenes
c) Reaction of oxygen atoms with
hydrocarbons
d) Reaction of oxygen atoms with ozone
6. At
room temperature formaldehyde is
a)
Gas b)
Liquid
c)
Solid d) None
7. Formalin
is____________% solution of H-C-H in H2O
a)
10% b) 20%
c)
40% d) 60%
8. Which
does not react with fehiling solution ?
a)
Acetaldehyde b) Propanone
c)
Glucose d)
Formic acid.
9. Aldehydes
can be distinguished from ketones by using
a)
Schiff's reagent b) Conc. H2SO4
c)
Anhy. ZNci2 d)
Resorcinol.
10. An
aidehyde on oxidation gives
a)
An alcohol b) An acid
c) A
ketone d) An ether
11. Bakelite
is obtained by condensation of
a)
Acetaldehyde and acetone
b)
Formaldehyde and phenol
c)
Acetaldehyde and phenol
d)
None of these
12. Carbonyl
group undergoes
a)
eliminatory reaction
b)
electrophilic addition
c)
niteophlic adelretion
d)
None of them
13. A
nucleophilic reagent will readily attack
a) Ethylene b) Ethanal
c) Ethanol d) Ethylamine
14. Which
of the following compounds gives a ketone with Grignard's reagent ?
a)
Formaldehyde b) Ethanenitrile
c) Ethyl alcohol d) Methyl iodide.
15. Which
of the following has carbon with lowest valency?
a) Carbides b) Alkenes
c) Alkynes d) Alkanes
16. Reduction
of aldehydes with HI and P give
a)
Primary alcohols b) Secondary
alcohols
c)
Alkanes d)
Tertiary alcohols.
17. Which
reaction yields Bakelite?
a)
Urea with HCHO
b)
Tetramethyl glycol with Hexamethylene diisocyanate
c)
Phenol and HCHO
d)
Ethylene glycol and
Dimethylterephthalate.
18. Paraaldehyde
is a polymer of
a)
Formaldehyde b) Acetaldehyde
c)
Benzaldehyde d) Propionaldehyde.
19. Acetone
is oxidized with
a)
Tollen's reagent
b)
Fehling solution
c)
Acidic dichromate solution
d)
Benedicts solution
20. Formaldehyde
when reacted with methyl magnesium
bromide gives
a) C2H5OH
b)
CH3COOH
c)
HCHO d)
CH3CHO
21. If
formaldehyde and KOH are heated them we
get
a)
Acctylenc b)
Methanc
c)
Methyl alcohol d) Ethyl formate.
22. Acetone
on reduction gives
a)
CH3COOH b)
CH3CHO
c)
(CH3)2CHOH d) C2H5OH
23. On
oxidation, ketones yield
a)
Alcohol b)
Amine
c)
Carboxylic acid d) Ether
24. Acetone
is used in the preparation of
a) Unbreakable glass
b) Smokeless gun powder
c) Chloroform
d) All of these
25. Calcium
acetate on dry distillation gives
a)
Formaldehyde b) Acetone
c)
Acetic acid d)
Ethanol
26. A
silver mirror test is for
a)
Aldehydes b)
Ketones
c)
Alcohols d)
Ethers
27. Aldehydes
can be distinguished from ketones by the use of
a)
Bayer’s test b) Grignard reagent
c)
Iodoform test d) Fehling solution
28. When
ammonia reacts with formaldehyde and 8% CH3OH is called
a) Bakelite
b) Para Formaldehyde
c) Meta Formaldehyde
d) Urotropine
29. When Hexamethylene tetramine (Methanamine)
reacts with fuming HNO3 to yield a powerful explosive known as
a)
Chloropicrin b) Picric acid
c)
Cyclonite d)
None of these
30. Which
one of the following reactions is not given by formaldehyde?
a) Reduction of Fehling’s solution
b) Reduction of Tollen’s solution
c) Formation of phenol complexes
d) Iodoform reaction
31.
Which tests are used for
the identification of –CHO in an aldehyde?
a) Bayer’s test b) Fehling’s test
c)
Tollen’s test d) Both b & c
32.
Benzaldehyde on reaction
with alkaline KMnO4 yields
a) Benzophenone b) Picric
acid
c)
Benzoic acid d) None of these
33.
Which of the following
undergoes halform reaction?
a) HCHO b)
CH3COCH3
c) C2H5 d)
C2H5O2CH5
34.
The compound which gives
both positive haloform test and Fehling test is
a) Acetone b)
Ethanol
c)
Formaldehyde d) Acetaldehyde
35.
Silver mirror is carried
out for the detection of functional group
a) Ketone b)
Ester
c)
Ether d)
Aldehyde
36.
The reagent which is used
to distinguish aldehydes and ketones is
a) Schiff’s reagent b)
Fehling reagent
c)
Tollen’s reagent d) All of these
37.
Which one does not pass
through aldol condensation?
a) Formaldehyde b)
Acetaldehyde
c)
Propanol d)
Acetone
38.
Acetaldehyde reacts with
moist chlorine to form
a) Acetyl chloride b)
Acetone
c)
Chloral d)
Chloroform
39.
The nucleophilic addition
reaction of carbonyl group are catalysed by
a) Salt b) Transition element
c)
Acids or bases d) All of these
40.
Aldols are those organic
compounds which contain functional group
a) – NH2 and COOH b)
– CHO and OH
c) –
CHO and – CO – d) None of these
41.
Cannizzaro reaction do not
occur in
a) H – CHO b)
C6H5CHO
c)
CH3CHO d)
All of these
42.
Reduction of ketone into
alkane in the presence of Zn – Hg is called
a) Aldol condensation
b) Cannizzaro reaction
c) Clemmensen’s reaction
d) None of these
43.
Aldehydes and ketones both
easily react with
a) Fehling solution b) Schiff’s reagent
c)
Grignard reagent d) Tollen’s
reagent
44.
Benzaldehyde reacts with
aniline to form
a) Schiff’s base b) Tollen’s reagent
c)
Borsche’s base d) Grignard
reagent
45.
Almost all the aldehydes
and small methyl ketones produce a crystalline white precipitate with saturated
solution of
a) RMgX b)
Cu(OH)2 + NaOH
c)
NaHSO3 d)
ROH
46.
Which compound gives brick
red precipitate of cuprous oxide with Benedict’s solution
a) Aromatic aldehyde b)
Aliphatic aldehydes
c)
Aromatic ketones d) Aliphatic ketones
47.
Ketones produced a wine red
or orange red color on adding
a) Fehling solution
b) Tollen’s solution
c) Alkaline sodium nitroprusside solution
d) All of these
48.
The IUPAC name of CH3CH
= CH – CHO is
a) But – 2 – enal b) But-2-en-3-al
c)
Methacrolein d) Propenaldehyde
49.
The IUPAC name of OHC – CHO
is
a) Glyoxal b)
Ethane-1, 2-dial
c)
Both a & b d) None is correct
50.
The IUPAC name of
OHC – CH2 – CH =CH –
CHO is
a) Pent-2-ene-1, 5-dial
b) Propene dialdehyde
c) Prop-1-en-1, 3-dial
d) None of the above
51.
The IUPAC name of (CH3)2C
= CHCOCH3 is
a) 4-methlypent-3-en-2-one
b) 2-Methlypent-3-en-4-one
c) Acetyl 2-Methyl-butene-3
d) None of the above
52.
Dry distillation of calcium
format yields _____
a) Ether b)
Formaldehyde
c)
Acetic acid d)
None of these
53.
When aldehydes are warmed
with ______ red precipitates of cuprous oxide are precipitated.
a) Grignard’s Reagent b) Fehlings solution
c)
KMnO4 d)
None of these
54.
Acetaldehyde reacts with
ammonia to form
________
a) Elimination b)
Substitution products
c)
Addition product d) Resin like
product
55.
Aldol condensation can
occur between ______
a) An aldehyde and ketone
b) An aldehyde and ester
c) An aldehyde and benzene
d) None of these
56.
An aqueous solution
containing about 40% of
formaldehyde and a little alcohol is
sold under the name of _______
a) Formalin b)
Malt-sugar
c)
Pyridine d)
Starch
57.
A nucleophilic addition of
carbonion, generated by the loss of proton from α-position of
an aldehyde or a ketone by a base, to the
carbonyl group is called _______
a) Nitration b) Aldol Condensation
c)
Esterification d) None
58.
The product obtained in the
following reaction is ________
CH3CH
= CH CHO LiAlH4 ?
a) CH3CH = CHCH2OH
b) CH3CH2CH2CHO
c) CH3CH2CH2CH2OH
d) A mixture of a, b and c.
59.
For a carbonyl compound
which of the following statements is correct?
a) The carbonyl carbon, oxygen and the other two atoms (attached to carbon) are coplanar.
b) The two groups attached to carbonyl carbon are directed at an angle of 120o
from each other.
c) The π electron density around oxygen is more than the carbonyl compound.
60.
The C = O bond and C = C
bond are similar in which of the following ways?
a) Both are made up of one sigma bond and one pi bond.
b) Both are planer in nature.
c) Both use sp2 hybrid orbitals of the C atom for their formation. d) All the above.
61.
The reaction of
acetaldehyde with conc. H2SO4 at room temperature
gives
a) Paraldehyde b) Metaldehyde
c)
A mixture of a & b d) None
62.
The following reaction
CH3CHO + HCN → CH3CH(OH)CN
is an example of
a) Nucleophilic addition
b) Electrophilic addition
c) Uncleophilic substitution
d) Electrophilic substitution
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