12th class (Fsc) Chemistry unit 8 MCQs
101. Which on of the following is used for artifical ripening of fruits:
a. Methane
b. Ethene
c. Propane
d. Ethyne
102. Mustard gas is obtained by the reaction of S2CI2 with:
a. Ethyne
b. Ethane
c. Methane
d. Ethene
103. Which compound is the most reactive one?
a. Ethane
b. Benzene
c. Ethene
d. Acetylene
104. When calcium carbide is treated with water we get:
a. Ethene
b. Ethyne
c. Ethanol
d. Ethane
105. Chloroprene is used for making:
a. Propane
b. Rubber
c. Liquid fuel
d. Petrol
106. Vinyl acetylene combines with HCL to form:
a. Butene
b. Polyacetylene
c. Chlorophrene
d. Divinyl acetylene
107. Vinyl acetylene combine with hydrochloric acid to form:
a. Chloroprene
b. Polyacetylene
c. Benzene
d. Divinyl acetylene
108. Sythentic rubber is made by polymerization of:
a. Divinyl acetylene
b. Chloroform
c. Chlorprene
d. Acetylene
109. Benzen in the presence of AICI3 produces acetophenone when reacts with:
a. Ethyl benzene
b. Acetyl chloride
c. Ethanoic add
d. Acetic acid
110. The substitution of a -H by -NO2 in benzene is called:
a. Sulphonation
b. Nitration
c. Reduction of benzene
d. Ammunolusis
111. Addition of unsymmerrical reagent to an unsymmetrical alkene is governed by:
a. Aldol condensation
b. Cannizzaro’s reaction
c. Markownikov’s
d. Kirchhoff rule
112. Ethylene gylcols are used as:
a. Freezing agent
b. Anesthetic
c. Anti-freezing agent
d. Knocking agent
113. Order of reactivity of alkenes with hydrogen halides is:
a. HF>HI>HO
b. HBr>HI>HCL
c. HI>HBr>HQ
d. HI>HBr>HF
114. The average bond energy of C-Br is:
a. 250 KJmol-1
b. 228 KJmol-2
c. 290KJmol-1
d. 200KJmol-1
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