CHM203: Organic Chemistry Ii TMA4 complete answer and Question

 

Question 1 : Keto-enol tautomer is an example of proton tautomers. True or false?
A.  Partially true
B.  Indifferent
C.  False
D.  True

Answer to Question 1 is D True

Question 2 : According to huckel rule for aromaticity, which of these rings might be aromatic compound?
Answer to question 2 is 10 and 14 electron

Question 3 : Benzene does not undergo frieldel-craft alkylation. True or false?
A.  Partially true
B.  False
C.  undefined
D.  True

Answer to Question 3 is B.  False
Question 4 : All are differences between tautomerism and resonance except?
A.  Resonance have a physical reality whereas tautomers structures are imaginary
B.  Tautomerism involves equilibrium between two or more tautomers while resonance does not
C.  Tautomerism involves equilibrium between two or more tautomers while resonance does not
D.  Tautomers have physical reality whereas resonance structures are imaginary

Answer to Question 4 is A.  Resonance have a physical reality whereas tautomers structures are imaginary
Question

5 : Benzene can be isolated from the following except?
A.  Whales oil
B.  None aromatic constituents of petroleum
C.  Plants oil
D.  Coal tar

Answer to Question 5 is C.  Plants oil
Question 6 : What is solvation?
A.  The interaction of dissolve specie in the presence of solvent
B.  The interaction of various mixture of solvent in the presence of dissolved species
C.  The interaction of acid with base in the presence of solvent
D.  Interaction of dissolved species and the solent molecules surrounding the species

Answer to Question 6 is B.  The interaction of various mixture of solvent in the presence of dissolved species

This answer is questionable please confirm it to sure

Question 7 : Benzene undergoes electrophilic addition reaction. True or false?
A.  True
B.  False
C.  Partially true
D.  undefined

Answer to Question 7 is B.  False

Question 8 : The two types of tautomerism include?
A.  Proton and valence tautomerism
B.  Keto-enol and proton tautomerism
C.  Proton and ring chain tautomerism
D.  Valence and ring chain tautomerism

Answer to Question 8 is A.  Proton and valence tautomerism

 

 

Question 9 : The intense UV absorption band for benzene is?
A.  1450 nm
B.  255 nm
C.  205 nm
D.  3030 nm

Answer to Question 9 is C.  205 nm
 

Question 10 : Write down the Enrich Huckel rule for aromaticity

Answer to question 10 is (4n + 2)¶

Question 11 : What is sulphonation of benzene?
A.  None of the above
B.  Removal of sulphonic group from benzene
C.  Addition of sulphonic group to benzene
D.  The replacement of hydrogen from benzene by sulphonic group.

Answer to Question 11 is D.  The replacement of hydrogen from benzene by sulphonic group.

Question 12 : The rapid and reversible inter-conversion of isomers which are related to each other with the actual movement of electrons as well as one or more atoms is refer to as?
A.  Isomerisation
B.  Steric hindrance effect
C.  Resonance effect
D.  Tautomerism

Answer to Question 12 is D.  Tautomerism

Question 13 : Solvent shell is?
A.  Solvents-dissolving species interaction
B.  Solvent molecule surrounding dissolving species
C.  Molecular shell of solvent
D.  Dissolving species surrounding solvent molecules

Answer to Question 13 is C.  Molecular shell of solvent

CHM291: Practical Chemistry Iii-inorganic TMA2 complete Question & Answer

Question 14 : The process of preparing hydrocarbons by passing alkanes over hot platinum catalyst is called?
A.  Aromatization
B.  hydroforming
C.  Aromatic cleavage
D.  alkylation

Answer to Question 14 is B.  hydroforming
Question 15 : The following are products of halogenation of benzene except____?
A.  Nitrobenzene
B.  Bromobenzene
C.  Chlorobenzene
D.  Iodobenzene

Answer to Question 15 is A.  Nitrobenzene
Question 16 : The catalytic reforming method depends on _________ of aliphatic hydrocarbons
A.  All of the above
B.  Dehydrogenation, cyclisation and isomerisation
C.  Dehydrogenation, cyclisation and alkylation
D.  Cyclisation, isomerisation and hydrogenation

Answer to Question 16 is B.  Dehydrogenation, cyclisation and isomerization

Question 17 : During frieldel-craft alkylation of benzene, which one of these catalyst is required?
A.  Nitric acid
B.  Lewis acid catalyst
C.  sulphuric acid catalyst
D.  Metallic oxide catalyst

Answer to Question 17 is B.  Lewis acid catalyst

Question 18 : Frieldel-craft reaction is limited to which one of these?
A.  Alkenyl halide
B.  Aryl halide
C.  Alkyl halide
D.  Aromatic amines

Answer to Question 18 is C.  Alkyl halide
Question 19 : In catalytic reforming, the aliphatic compound heptane will be converted to which compound?
A.  Xylene
B.  Benzene
C.  Ethylbenzene
D.  Toluene

Answer to Question 19 is D.  Toluene
Question 20 : The process where toluene and xylene are converted to benzene is called?
A.  Hydroforming
B.  Alkylation
C.  Hydrodealkylation
D.  Catalytic reforming

Answer to Question 20 is C.  Hydrodealkylation
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