12th class (Fsc) Chemistry unit 12 MCQs
51. Reduction of ketone with NaBH4 will give:
a. An alcohol
b. An organic acid
c. A ketone
d. An aldehyde
52. Following is an aromatic aldehyde:
a. Pentanol
b. Butanone
c. 2-pentanone
d. None of these
53. Cyclooentanol undergoes oxidation to give:
a. Cyclepentane
b. Cyclopentene
c. Cyclopentanol
d. Cyclopentanone
54. When aldehydes are warmed with an ammonical solution of AgNO3 , this test is know as
a. Fehlings solution test
b. Silver mirror test
c. Ring test
d. None of these
55. The appearance of solver mirror in Tollen’s test indicate the presence of;
a. Alkene
b. Ketone
c. Alcohol
d. Aldeyde
56. The carbon atom of a carbonyl group:
a. Sp3 hybridized
b. Sp hybridized
c. Sp2 hybridize
d. None of these
57. Formation is:
a. 40% solution of formaldehyde in water
b. 10% solution of formaldehyde in water
c. 60% solution of formaldehyde in water
d. 20% solution of formaldehyde in water
58. Which of the following will have the highest boiling point?
a. Propanal
b. Methanal
c. 2-Hexanone
d. Ethane
59. Ketones are prepared by the oxidation of:
a. Tertiary alcohol
b. Primary alcohol
c. Secondary alcohol
d. None of these
60. Acetone reacts with HCN to form a cyanohydrine, it is an example of:
a. Nucleophilic addition
b. Electrophilic addition
c. Nucleophilic substitutio
d. Electrophilic substitution
61. Which of the following compounds will not give iodoform test on treatment with I2 / NaOH.
a. Butanone
b. Acetaldehyde
c. 3-pentanone
d. Acetone
62. Cannizzaro’s reaction is not given by:
a. Benzaldehyde
b. Formaldehyde
c. Trimethylacetaldehyde
d. Acetaldehyde
63. Which one of the following reagent will react with both aldehydes and ketones?
a. Fehlings’s reagent
b. Grignard reagent
c. Benedict’ reagent
d. Tollen’s reagent
64. Formation of actealdehyde from ethanol is know as:
a. Oxidation
b. Reduction
c. Substitution
d. Addition
65. Metaformaldehyde is prepare in the presence of which dil.acid?
a. HNO3
b. H2SO4
c. H2CO3
d. HCL
66. Calcium acetate on heating gives:
a. Ethane
b. Acetaldehyde
c. Acetic acid
d. Acetone
67. Acetone reacts with HCN to form a cynahydrine. it is an example of:
a. Necleophilic addition
b. Electrophilic addition
c. Necleophilic Substitutio
d. Electrophilic Substitution
68. Methyl ketones are characterized by:
a. Benedicts’s reagent
b. Tollen’s reagent
c. Fehling solution
d. Iodoform test
69. Silver mirror is given by:
a. Ethers
b. Aldehydes
c. Tollen’s test
d. Lucas test
70. Which test is called silver mirror test?
a. Benedict’test
b. Tollen’s test
c. Sodium nitro prusside test
d. Fehling’s test
71. Which reaction is disproportionate reaction?
a. Haloform reaction
b. Aldol condensation
c. Acid catalysed reaction
d. Cannizzaro’s reaction
72. Canizzaro’s reaction is not given by:
a. Butanone
b. Acetaldehyde
c. Acetone
d. None of these
73. Addition of alcohol in carbonyl compounds gives acetal, the geometry of acetal is:
a. Tetrahedral
b. Linear
c. Planar
d. Trigonal
74. Formation of acetaldehyde from ethanol is known as:
a. Oxidation
b. Reduction
c. Substitution
d. Addition
75. The compound used in the processing of anti,polio vaccine is:
a. Acetone
b. Acetaldehyde
c. Ethyl bromide
d. Formaldehyde