12th class (Fsc) Chemistry unit 11 MCQs
51. According to Lewis concept ethers are:
a. Acids as well bases
b. Acids
c. Neither acids nor bases
d. Bases
52. Williamson synthesis is used for the synthesis of:
a. Ether
b. Phenol
c. Aldehyde
d. Alcohol
53. When ethyl bromide is heated with Ag2 O in the absence of moisture the product formed is:
a. Ethanal
b. Ethanol
c. Ethene
d. Diethyl ether
54. Which of the following compound has no unsaturation:
a. Ohenol
b. Methanal
c. Benzoic acid
d. Methyoxy methane
55. Ethers are stored in brown bottles. This is because on exposure to air and light ethers are converted to:
a. Ozonides
b. Peroxides
c. Electrophiles
d. Oxonium ions
56. Which of the following is the hybridization of oxygen in ethers:
a. Dsp2
b. Sp2
c. Sp3
d. Sp
57. What is the name of ROR group?
a. Alkenyl group
b. Acetyl groups
c. Alkyl group
d. Aloxy group
58. Which of the following is a simple ether:
a. C2H5OCH3
b. CH3OCH3
c. CH3OC2H5
d. C6H5OCH3
59. Hydrogenation of phenol gives……:
a. Cyclohexane
b. Cychlohexanol
c. Benzene
d. Cyclohexene
60. When ethanol is heated at 180 C in the presence of conc.H SO then the product is:
a. Ethane
b. Diethyl ether
c. Methanol
d. Ethene
61. Which compounds shows by hydrogen bonding:
a. CH3-0-CH3
b. C2H2
c. C2H5OH
d. CH5CL
62. Which compound shows maximum hydrogen with water?
a. CH3-0-CH3
b. C2H6
c. C6H5OH
d. C2H5OH
63. Which compound is more soluble in water:
a. CH3COCH
b. C3H5 OH
c. n-hexanol
d. C6H5OH
64. Which compound will have the maximum repulsionm with H2O?
a. CH3CH2CH2OH
b. C6H6
c. CH3 -O-Ch3
d. C2H5OH
65. Ethanol can be converted into ethanoic acid by:
a. Oxidation
b. Hydrogenation
c. Fermentation
d. Hydration
66. Which eneyme is not involved in fermentation of starch?
a. Urease
b. Diastase
c. Invertase
d. Zymase
67. Which compound is called as universal solvent?
a. C2H5OH
b. H2O
c. CH3-O-CH3
d. CH3OH
68. Methyl alcohol is not used:
a. As a substitute for petrol
b. As a solvent
c. For denaturing of ethyl alcohol
d. A an antifreezing agent
69. Rectified spirit contains alcohols about:
a. 90%
b. 80%
c. 95%
d. 85%
70. According to Lewis concept ethers behave as:
a. Acid as well as a base
b. Base
c. Acid
d. None of them
71. The correct names of CH3-CH=CH-CH2OH is:
a. 2-buten-1-o1
b. 2-buten-4-o1
c. None of these
d. 3-buten-1-o1
72. Alcohol obtained by fermentation in only 12% and water exceeds:
a. 100%
b. 14%
c. 85%
d. 10%
73. Absolute alcohol can be obtained from recitified spirit:
a. By re-distillation in the presence of CaO
b. By adding sodium metal
c. Not possible because of azeotropic mixture
d. By extraction
74. Which of the following posses higher boiling point?
a. Methylchloride
b. Methanol
c. Glycol
d. Ethanol
75. Tertiary alcohol is obtained by treating Grignard reagent with:
a. CH3COCH3
b. HCHO
c. CO2
d. CH3CHO