Chemistry Chapter 14 Entry Test MCQs
101. For preparing monoalkyl benzene, acylation process is preferred than direct alkylation because
a. In alkylation, large amount of heat is evolved
b. In alkylation, a poisonous gas is evolved
c. Alkylation is very costly
d. In alkylation, polyalkylated product is formed
102. Acylation process is preferred than direct alkylation because (by the Friedel-Craft’s reaction)
a. In alkylation, large amount of heat is evolved
b. In alkylation, a poisonous gas is evolved
c. Alkylation is very costly
d. Benzene is more stable in acylation
103. Coaltar is main source of
a. Aliphatic compounds
b. Aromatic compounds
c. Heterocyclic compounds
d. Cycloalkanes
104. Point out the wrong statement in relation to the structure of benzene
a. It is a resonance hybrid of a number of canonical forms
b. It forms only one monosubstitution product
c. It has three delocalised pi- molecular orbitals
d. The C – C bond distance in benzene is uniformly 1.397 Å
105. On heating a mixture of sodium benzoate and sodalime, the following is obtained
a. Benzene
b. Toluene
c. Benzoic acid
d. Phenol
106. The reaction of toluene with chlorine in presence of ferric chloride gives predominantly
a. Benzyl chloride
b. Benzoyl chloride
c. o- and p-hlorotoluenes
d. m-chlorotoluene
107. What is the end product which is obtained on the nitration of toluene
a. 2,4-dinitrotoluene
b. o-nitrotoluene
c. 2,4,6-trinitrotoluene
d. p-nitrotoluene
108. Which of the following would be least reactive towards bromine
a. Anisole
b. Nitrobenzene
c. Chlorobenzene
d. Phenol
109. (i) Chlorobenzene and (ii) benzene hexachloride are obtained from benzene by the reaction of chlorine, in the presence of
a. (i) Sodium hydroxide and (ii) sulphuric acid
b. (i) Direct sunlight and (ii) anhydrous AlCl3
c. (i) Anhydrous FeCl3 and (ii) direct sunlight
d. (i) Ultraviolet light and (ii) anhydrous FeCl3
110. Benzene can be obtained by heating either benzoic acid with X or phenol with Y. X and Y are respectively
a. Soda lime and zinc dust
b. Zinc dust and soda lime
c. Soda lime and copper
d. Zinc dust and sodium hydroxide
111. Benzene is obtained by
a. Addition of three C2H2 molecules
b. Substitution of three acetylene molecules
c. Condensation of three C2H2 molecules
d. Polymerisation of three C2H2 molecules
112. A student will try to synthesize 4-chloro-2-nitrotoluene from benzene, what sequence cannot be followed?
a. Alkylation-Nitration-Halogenation
b. Alkylation-halogenation-nitration
c. All process occurs at same time
d. Nitration-alkylation-halogenation
113. Which of the following is the benzo group?
a. (C6H5)2CH—
b. C6H5CH2—
c. C6H5C—
d. C6H5CH—
114. Which of the following does not have aromatic characteristics?
a. cyclopropenyl cation
b. Cycloheptatriene
c. Naphthalene=C10H8
d. cyclopentadienyl anion
115. Which of the following sequences regarding the rate of halogenation is correct?
a. Fluorination < chlorination < bromination
b. Fluorination > chlorination > bromination
c. Fluorination > chlorination < bromination
d. Fluorination < chlorination > bromination
116. Six carbon atoms of benzene are of
a. three types
b. one type
c. six types
d. two types
117. Select the true statement about benzene amongst the following
a. There is cyclic delocalisation of pi-electrons in benzene
b. Because of unsaturation benzene easily undergoes addition
c. Monosubstitution of benzene gives three isomeric products.
d. There are two types of C – C bonds in benzene molecule
118. The benzene molecule contains
a. 4sp3 hybrid carbons
b. 2sp2 hybrid carbons
c. 3sp3 hybrid carbons
d. 3sp2 hybrid carbons
119. The no. of sp2 hybrid orbitals of benzene:
a. 15
b. 6
c. 18
d. 12
120. Aromatic compounds burn with sooty flame because
a. they have a relatively high percentage of hydrogen
b. they have a ring structure of carbon atoms
c. they have a relatively high percentage of carbon
d. they resist reaction with oxygen of air
121. Benzene can be directly obtained from
a. Chlorobenzene
b. Acetylene
c. Phenol
d. All the above
122. Which of the following is not a characteristic property of arenes?
a. Resonance
b. Delocalisation of 𝞹-electrons
c. Electrophilic additions
d. Greater stability
123. Which of the following is incorrect for electrophilic substitution?
a. -Cl is activating and o, p-directing
b. -NO2 is deactivating and m-directing
c. -CH3 is activating and o, p-directing
d. -OH is activating and o, p-directing
124. The number of benzylic hydrogen atoms in ethylbenzene is:
a. 2
b. 3
c. 7
d. 5
125. Which of the following groups are most likely to be o, p directing?
a. Activating
b. Deactivating
c. Neutral
d. All of the above