Aldehydes and Ketones MCQ's
MCQ's with answers from chapter 12 Aldehydes and Ketones chemistry book 2 for FSC pre engineering and pre medical for Board of Intermediate and Secondary education. Also For Entry Test Preparation for UET, NUST, PIEAS, GIKI, AIR, FAST, WAH University, UHS, other engineering Universities and Medical Colleges.
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 ?
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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