Chemistry Chapter 14 Entry Test MCQs
126. Aniline is a derivative of benzene which contains
a. Amide group
b. Imino group
c. Nitro group
d. Amino group
127. Michael Faraday discovered benzene in the gas which was produced by destructive distillation of vegetable oil that is done in
a. The presence of Hydrogen
b. The presence of Oxygen
c. The presence of excessive Oxygen
d. The absence of Oxygen
128. By which method the molecular mass of benzene was determined as 78.108?
a. Vapour density method
b. Specific gravity method
c. Distillation methods
d. X-ray diffraction method
129. What catalyst is employed when benzene is prepared from acetylene at 70°C?
a. Organo-nickel
b. Cr2O3 + Al2O3 + SiO2
c. Ni 250 – 300°C
d. Raney nickel
130. Which one of the following statement is not correct about benzene?
a. Resonance energy of benzene is 150.5 KCal/mole
b. On hydrogenation 208 KJ/mole is liberated
c. C-H bond length in benzene is 1.09 A°
d. The molecular mass of benzene is 78.108amu
131. Replacement of hydrogen of benzene by alkyl group in the presence of alkyl halide & aluminium chloride is known as
a. Friedel & Craft acylation
b. Dows process
c. Clemmenson reduction
d. Friedel & Craft alkylation
132. What is the molecular formula of Benzenetriozonide?
a. C6H5O9
b. C6H6O9
c. C6H6O6
d. C6H5O8
133. Benzene reacts with n-propyl chloride in presence of anhydrous AlCl3 to give predominantly:
a. cumene
b. n-Propylbenzene
c. Isopropylbenzene
d. both b and c
134. Correct statement is:
a. In benzene, carbon uses all the three p orbitals for hybridization.
b. Although benzene contains three double bonds, normally it does not undergo addition reaction
c. An e– donating substitutent in benzene orients the incoming electrophilic group to m-position.
d. m-chlorobromobenzene is an isomer of m-bromochlorobenzene.
135. Which aromatic compound is obtained when n-octane undergoes catalytic hydroforming:
a. propylbenzene
b. ethyl benzene
c. p-Xylene
d. methylbenzene
136. Nitrobenzene can be prepared from benzene by using a mixture of conc. HNO3 and conc. H2SO4. In the nitrating mixture HNO3 acts as a:
a. Reducing agent
b. Base
c. Catalyst
d. Acid
137. Benzene is a resonance hybrid mainly of two Kekule structures. Hence:
a. Two structures make equal contribution to resonance hybrid
b. Half of the molecules correspond to one structure, and half of the second structure
c. An individual benzene molecule changes back and forth between two structures
d. At low temperatures benzene can be separated into two structures
138. Reaction of SO3 is easier in:
a. Nitrobenzene
b. Benzene
c. chlorobenzene
d. Toluene
139. Which order is correct for the decreasing reactivity to ring monobromination of the following compounds: (I) C6H5CH3 (II) C6H5COOH (III) C6H6 (IV) C6H5NO2
a. II > III > IV > I
b. I > II > III > IV
c. III > I > II > IV
d. I > III > II > IV
140. An aromatic compound of molecular formula C6H4Br2 was nitrated then three isomers of formula C6H3Br2NO2 were obtained. The original compound is:
a. o-dibromobenzene
b. m-dibromobenzene
c. p-dibromobenzene
d. Both A & B
141. Which one of the following will undergo meta substitution on monochlorination
a. Ethyl benzoate
b. Ethoxy benzene
c. Phenol
d. Chlorobenzene
142. Which combination of reagents used in the indicated order with benzene will give m-nitropropylbenzene?
a. 1) HNO3/H2SO4, 2) CH3CH2CH2Cl/AlCl3
b. 1) CH3CH2CH2Cl/AlCl3, 2) HNO3/H2SO4
c. 1) CH3CH2COCl/AlCl3, 2) HNO3/H2SO4, 3) H2NNH2/NaOH
d. 1) HNO3/H2SO4, 2) CH3CH2COCl/AlCl3, 3) H2NNH2/NaOH
143. The rate determining step in electrophilic substitution reaction is __
a. All of the mentioned
b. Generation of electrophile
c. Attack by an electrophilic reagent on benzene ring
d. Formation of product
144. __ act as electrophile in halogenation
a. Nitronium ion
b. Halogenonium ion
c. Acylium ion
d. Sulphonium ion
145. Select a nucleophile from the following:
a. Carbanion
b. Nitronium ion
c. Ammonium ion
d. Carbonium ion
146. Not a product of the reaction of benzene with CH3Cl and AlCl3 is _
a. O-xylene
b. Toulene
c. Isopropyl benzene
d. P-xylene
147. Which of the following are The product of Friedel-Crafts Acylation reactions?
a. Alkylbenzene
b. Arylketone
c. Halobenzene
d. Alkylamine
148. Convert the benzene into n-propyl benzene
a. Friedel-Crafts Alkylation
b. Friedel-Crafts Acylation followed by clemmensen reduction
c. Friedel-Crafts Acylation
d. Friedel-Crafts Alkylation followed by clemmensen reduction
149. To restore aromatic character, sigma complex releases
a. Electrophile
b. Hydride ion
c. Electrons
d. Proton
150. Which of following sets of substituents are all m-directing in electrophilic substitution reaction?
a. COCH3,CONR2,NH2
b. Cl, NH2, CH3
c. OCOCH3,OH, CN
d. CN, SO3H,CHO
151. This can be an alkyl halide in the Friedel Crafts reaction
a. bromobenzene
b. isopropyl chloride
c. chloroethene
d. Chlorobenzene
152. Hydrogen to carbon ratio in aromatic hydrocarbons is choose which one is correct:
a. Equal
b. Low
c. Can’t predicted
d. High
153. On hydrogenation benzene liberates energy choose which one is correct:
a. 208 kJ-mol−1
b. 358.5 kJ/mole
c. 150.5 kJ-mol−1
d. 119 kJ-mol−1