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WorksheetsOrganic chem first
Total questions: 25
Worksheet time: 50mins
Which is the best reaction sequence to prepare 4-
nitrotoluene from benzene?
A)CH3Br/AlCl3 then HNO3/H2SO4
B)HNO3/SO3 then Br2/FeBr3
C)HNO3/H2SO4 then. CH2=CH2/H+
D)HNO3AlCl3 then CH3Br/H2SO4
E)HNO3/H2SO4 then CH3Br/AlCl3
?
conformation
constitutional isomers
resonance structures
identical
The most stable conformation of 1-butyl-1-ethylcyclohexane
will have :
both groups equatorial
both groups axial
butyl equatorial, ethyl axial
butyl axial,ethyl equatorial
Which of the following isomeric (C6) alkanes has lowest
boiling point?
n-hexane
2,2-dimethylbutane
3-methylpentane
isohexane
2-methylpentane
What reagents are typically required to accomplish bromination of an aromatic ring?
Br2 + light
Br2 + HBr
Br2+H2SO4
Br2 + FeBr
Which compound would be the most reactive towards ring bromination?
Select the correct name for PhCH2Br
benzyl bromide
bromobenzyl
bromobenzene
phenyl bromide
Which diene has conjugated double bonds ?
What is the gometry and hybridization of C in H3C-CH3
Planar sp2
Tetrahedral sp2
Linear sp
Tetrahedral sp3
Trigonal planar sp3
What number of maximum constitutional isomers in c4H9Br
Two
Three
Four
Five
Which of the folking structures is the least stable?
The least stable (most strained) of the following
Cyclobutane
Cyclopentane
Cyclopropane
Cyclohexane
The correct reagent for the following transformation
H2/ lindlars catalyst
H2O / H+
Bh3, H2O2 , OH-
KMno4
Which trace by-product is formed in a chain-terminating step in the bromination of ethane?
HBr
1,2-dibromoerhane
Propane
Butane
Which of the following is a correct structure for one of the resonance structures of the intermed in a nitration reaction of benzene?
The correct reagent for nitration of benzene ring is:
HNO3 only
No2
HNO3/H2SO4
H2So4 only
HNO2/ H2SO4
Which of the following carbocation is the least stable
A
B
C
D
Which name is incorrect ?
p-nitrophenol
2,6-dibromobenzoic acid
2-bromo-3-chlorotoluene
5-nitrotoluene
m-diethylbenzene
Which of the following is a deactivating group?
I
II
III
V
IV
The relationship between these two structures
Configurational
Constitutional
Identical
Conformers
Which of the following is the correct IUPAC name?
2-isopropyl-2-methylheptane
1,1,2,2-tetramethylheptane
2,3,3- methyloctane
2,3,3- trimethyloctane
What is the structure of naphthalene ?
Which one of the following has the highest resonance energy
Which electrify is used to make acetophenone from benzene
+Ch3
So3
ch3C+O
NO2+
Which of the following would you expect to have polar covalent bones?
MgF2
CO
F2
NF3
NaF
