12th class (Fsc) Chemistry unit 8 MCQs
76. Preparation of vegetable gee involves:
a. Hydroxylation
b. Halogenation
c. Dehydrogenation
d. Hydrogenation
77. Formula of chloroform is:
a. CH2Cl2
b. CH3Cl
c. CHCl3
d. CCl4
78. The presence of a double bond in a compound is the sign of:
a. Subsititution
b. Unsaturation
c. Saturation
d. None
79. Vinyl-acetylene combines with HCL to form:
a. Chloroprene
b. Poly acetylene
c. Divinyl acetylene
d. Benzene
80. The addition of unsymmetrical reagent to an ussymmetrical alkane is in accordance with the rule:
a. Pauli’s exclusion principle
b. Hund’s rule
c. Auf bau principle
d. Markownikov’s rule
81. Synthetic rubber is made by polymerization of:
a. Divinylacetylene
b. Chloroform
c. Chloroprene
d. Acetylene
82. B-B dichloroethy sulphide is commonly known as:
a. Phodgene gas
b. Mustard gas
c. Bio-gas
d. Laughing gas
83. When methane reacts with CI2 in the presence of diffused light the product obtained are:
a. Chloromethane and dichloromethane
b. Chloroform only
c. Mixture of a.b.c
d. Carbon tetrachloride only
84. Which one of the following gases is used for artificial ripening of fruits.
a. Methane
b. Ethane
c. Propane
d. Ethyne
85. Marsh gas:
a. C3H8
b. CH4
c. C4H10
d. C2H4
86. Sabatier-sendern’s reaction can be used to prepared:
a. Alkenes
b. Alkanes
c. Alkynes
d. All of these
87. Preparation of vegetable Ghee involve:
a. Hydroxylation
b. Halogenation
c. Dehydrogenation
d. Hydrogenation
88. The presence of a double or triple bond is:
a. Addition
b. Unsaturation
c. Substitution
d. Saturation
89. Which type of reaction are given by alkanes?
a. Substitution
b. Plymerization
c. Addition
d. Elimination
90. When methane reacts with CI2 in the presence of diffuse light the products obtained are:
a. Cholormethane and dichoromethane
b. Chloroform only
c. Mixture of a,b,c
d. Carbon tetrachloride only
91. The formula of dichloromethane is:
a. CH3 Cl
b. Cl2CH2
c. CCl4
d. CHCl3
92. The isomerism shown by alkanes is:
a. Geometric
b. Skeletal
c. Metamerism
d. Position
93. Addition of hydrogen accompanied by a bond cleavage is called:
a. Hydrogenolysis
b. Hydrogenation
c. Hydroxylation
d. Hydrolysis
94. When aqueous solution of saturated faty acid is electrolyzed we get;
a. Alkyne
b. Alkane
c. Alcohol
d. Alkene
95. The characteristic reaction of alkanes are:
a. Condensation
b. Addition
c. Polymerization
d. Substitution
96. The common name of alkenes have the sufix:
a. -eylene
b. -ene
c. -yne
d. -ylene
97. The presence of double bond in a compound is the sign of:
a. Substitution
b. Saturation
c. Dehydrogenation
d. Unsaturation
98. Which compound has acidic hydrogen?
a. 1-butyne
b. Butane
c. 2-butyne
d. 1-butene
99. Bayer’s reagent is:
a. NH2NH2
b. Cold.dil 1% KMnO4
c. Br2 in CCI4
d. HCL+ZnCI4
100. The addition of unsymmetrical reagent to an unsymmetrical alkene is in accordance with the rule:
a. Paulli,s Exclusion principle
b. Markownikov’s rule
c. Hund’rule
d. All of these