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2023 SEM 1 INORG & ORG CHEM > aromatic compounds > Flashcards

aromatic compounds Flashcards

(88 cards)

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1
Q

benzene undergoes mainly

A

substitution

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2
Q

what is the simplest aromatic hydrocarbon

A

benzene

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3
Q

what is the molecular formula of benzene

A

C6H6

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4
Q

in the kekule structure, do the single and double bond alternate around the ring

A

yes

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5
Q

what is a highly unsaturated molecule

A

benzene

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6
Q

what is the positive test for unsaturated benzene

A

if the orange red colour of bromine disappears/ decolorizes

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7
Q

what cant take place when the single and double bonds exchange position around the ring of the kekule structure

A

the reactions of alkanes cant take place

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8
Q

do the rings move slowly or rapidly around the single and double bonds exchange position around the ring of the kekule structure

A

rapidly

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9
Q

what is more stable than either of its contributing kekule structure

A

benzene

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10
Q

in the orbital model for benzene, each carbon atom is what hybridized

A

sp2

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11
Q

what is the angle of the orbital model for benzene
H-C-C
C-C-C

A

120 degree

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12
Q

in the delocalized pi cloud of benzene, what do the circle emphasize

A

it emphasize that the electrons are distributed evenly around the ring

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13
Q

the kekule structure is what kind of form

A

resonance form

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14
Q

the benzene ring is what kind of form

A

simplified depiction

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15
Q

is the double bonds in benzene are in fixed positions and why

A

no because the electrons are distributed evenly around the ring

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16
Q

what is ‘o’

A

ortho

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17
Q

what is ‘m’

A

meta

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18
Q

what is ‘p’

A

para

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19
Q

‘o’ is on what carbon

A

2&6

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20
Q

‘m’ is on what carbon

A

3&5

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21
Q

‘p’ is on what carbon

A

4

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22
Q

how to name benzene (from my understanding)

A

prefix + substituent + benzene

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23
Q

what is classified as arenes

A

aromatic compounds

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24
Q

aromatic carbons is classified as

A

arenes

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25
Ar
aryl group
26
R
alkyl group
27
what is the removal of hydrogen from aromatic ring
aryl group
28
what is the removal of one hydrogen from an alkane chain (from an alkane substituent)
alkyl group
29
define arly group
the removal of hydrogen from aromatic ring
30
define alkyl group
the removal of one hydrogen from an alkane chain (from an alkane substituent)
31
what are the 2 aromatic compounds
phenyl group benzyl group
32
what is formed by removing one H from benzene
phenyl group
33
what is the molecular formula of phenyl group
C6H5
34
what is the molecular formula of benzyl group
C6H5CH2
35
benzene undergoes substitution reaction but it reacts slowly with
Br2
36
which structure has a cyclic planar
benzene
37
what is the C-C bond length of benzene
1.39 A
38
benzene is intermediate to
c-c & c=c
39
what is the extra stability associated with aromatic compound
aromaticity
40
what are the requirements to know that it is an aromatic compound
cyclic planar fully conjugated contain 4n+2pi electrons
41
in benzene, are all C-C bonds the same
yes they are resonance
42
in benzene, what bonds are in equal length
C-C
43
what is the measure of the extra stability of the cyclic conjugated system compared to corresponding no. of isolated double bonds
resonance energy
44
what are the 2 effects of the large resonance stabilization energy
stabilization energy lost when an electrophile adds to the ring stabilization energy regained when an electrophile adds to the ring intermediate carbocation loses a H+
45
in the effect of large resonance stabilization energy, when energy is lost when an electrophile adds to the ring. hence, what do we need to use
a catalyst (much stronger electrophiles)
46
in the effect of large resonance stabilization energy, when energy is regained when an electrophile adds to the ring intermediate carbocation loses a H+. this results in
substitution
47
what has a cyclic conjugated with 6pi electrons
benzene
48
what are the 6 common substitution reactions in electrophilic aromatic substitution
chlorination bromination nitration sulfonation alkylation acylation
49
EAS
electrophilic aromatic substitution
50
do all EAS have the same mechanism
yes
51
the reaction rates of EAS depends on the attack of...
electrophile on the benzene ring
52
in the reaction rates of EAS, groups that has a high charge density..
speed up reaction
53
in the reaction rates of EAS, groups that has a low charge density..
slow down reaction
54
EDG
electron donating group
55
EWG
electron withdrawing group
56
is o,p-directing EDG or EWG
EDG
57
is m-directing EDG or EWG
EWG
58
EDG activates or deactivates the ring
activate
59
EWG activates or deactivates the ring
deactivate
60
EDG activate the ring to stabilize or destabilizing the wheland intermediate
stabilize
61
EWG activate the ring to stabilize or destabilizing the wheland intermediate
destabilizing
62
all alkyl group are what kind of directors
ortho, para directors
63
ortho and para directors has any substituent that has...
lone pairs of electrons
64
meta directors has any substituent that has a...
positively polarized atom (delta plus, delta minus) tat is directly attached to the ring
65
in the synthesis of organic compounds, you need to know the
reactions and their directing effects
66
what is the production of new mol. needed for drugs
the synthesis of organic compounds
67
in the synthesis of organic compound, what works backward from the products
retrosynthesis
68
in the synthesis of organic compound, what is the production process
synthesis
69
what do you call a multiple fused rings
polycyclic aromatic hydrocarbons
70
polycyclic aromatic hydrocarbons exists in
fullerenes and carbon nano tubes
71
in polycyclic aromatic hydrocarbons, you need to obey what rule and criteria for...
huckel's rule criteria for aromacity
72
what is the common sunscreen used
PABA
73
what is the common environmental pollutant
Benzo[a]pyrene
74
pesticides DDT is formed by what reaction
cholrination
75
sulfanilamide is formed by what reaction
nitration reaction
76
how many pi bonds do benzene have
6
77
in halogenation, what is added to the benzene and in the presence of...
X2 FeX2 (lewis acid catalyst)
78
what is the product of halogentation
benzene attached to X + HX
79
in nitration, what is added to the benzene and in the presence of...
HNO3 (nitric acid) H2S04 (sulfuric acid)
80
in sulfonation, what is added to the benzene and in the presence of...
H2SO4 (sulfuric acid) heat
81
in alkylation (friedel-crafts), what is added to the benzene and in the presence of...
RCl (alkyl halide) AlCl3 (lewis acid catalyst)
82
in alkylation, what is added to the benzene and in the presence of...
CH2=CH2 (ethene) H+
83
in acylation (friedel-crafts), what is added to the benzene and in the presence of...
acyl chloride (search up the structure) AlCl3 (catalyst)
84
what is the product of nitration
nitrobenzene + H2O
85
what is the product of sulfonation
SO3H attached to benzene (benzenesulfonic acid) + H2O
86
what is the product of alkylation (friedel-crafts)
R(R is an alkyl group) attached to benzene (alkyl benzene) + HCl
87
what is the product of alkylation
ethylbenzene only
88
what is the product of acylation (friedel-crafts)
look at textbook

2023 SEM 1 INORG & ORG CHEM (22 decks)

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