Worksheets3rd semester Internal Exam 2020-21 Compl1
Total questions: 20
Worksheet time: 21mins
Electrophile of nitration of benzene is
NO2+
NO2-
NO2
HNO3
Benzene is characterized by
Addition reaction
Rearrangement reaction
Electrophilic substitution reaction
Nucleophilic substitution reaction
C6H6 + CH3Cl in the presence of AlCl3 gives
Electrophile is
an electron rich species
electron deficient species
Free Radical
None of the above
Which of the following is a benzenoid compound?
Naphthalene
Pyridine
Indole
Which is a meta director
Alkyl group
halogens
Nitro group
OH group
Huckle number of pyridine is
8
6
10
2
In Friedel Craft's acylation reaction
Halogen is introduced to benzene
RCO group is introduced to benzene
NO2 group is introduced to benzene
SO3H group is introduced to benzene
The intermediate formed during electrophilic substitution reaction of benzene
Arenium ion
phenyl ion
Benzene anion
methyl cation
The reagent and catalyst used for Friedel Craft's alkylation of benzene respectively are
RCl, HCl
RCl, AlCl3
AlCl3, HCl
AlCl3, RCl
Hybridisation of carbon in benzene is
sp3
sp
sp2
sp2d
Identify the compound
Aminobenzene
Toluene
Aniline
Benzamide
Choose the incorrect statement
Aromatic compounds are cyclic
Benzene normally undergoes addition reactions
All deactivating groups are meta directors
All carbon atoms in benzene are sp2 hybridized
Identify carbocation
CH3
CH3-
CH3+
CH4
Species formed and consumed during the progress of the reaction are called
Products
Reactants
Intermediates
Catalysts
Free radicals are formed as a result of heterolytic bond cleavage
True
False
Hybridisation of carbon in carbanion
sp
sp3
sp2
sp2d
Stability order of carbanions is....
tertiary < secondary < methyl < primary
secondary < primary < tertiary < methyl
methyl < primary < secondary < tertiary
tertiary < secondary < primary < methyl
Electron shift along a chain of atoms through single bond is known
Mesomeric effect
Electromeric effect
Hyperconjugation
Inductive effect
Decreasing order of rate of esterification .
CH3-COOH < CH3CH2-COOH < (CH3)2CH-COOH > (CH3)3C-COOH
CH3-COOH > CH3CH2-COOH > (CH3)2CH-COOH > (CH3)3C-COOH
(CH3)3C-COOH > CH3CH2-COOH > (CH3)2CH-COOH > CH3-COOH
CH3-COOH > CH3CH2-COOH > (CH3)3C-COOH > (CH3)2CH-COOH
