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KEAM > Organic chem > Flashcards

Organic chem Flashcards

1
Q

Isomers with 4 C

A

2

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2
Q

Isomers with 5C

A

3

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3
Q

isomers with 6 C

A

5

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4
Q

Isomers with 7C

A

9

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5
Q

Isomers with 8 C

A

18

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6
Q

Isomers with 9C

A

35

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7
Q

Isomers with 10 C

A

75

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8
Q

Resonance effect

A

Effect due to resonance, if charged centers are developed

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9
Q

e’ donating grps

A

CH3, NH2, NR2, NHR, OH, OR, X

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10
Q

e’ withdrawing grps

A

CHO, CO, COOH, CN, COX, CONH2, COOR, NO, NO2

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11
Q

Inductive effect

A

Polarisation produced in a σbond due to diff in e’ -veity b/n atoms

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12
Q

I effect inversely prop to

A

dist b/n atms

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13
Q

-I effect order

A

NR3>NO2>CN>SO3H>CHO>COOH>F>Cl>Br>I>OH>NH2

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14
Q

Hyperconjugation

A

Migration of Ch σ bond e of sp3 to sp2

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15
Q

Hyperconjugation also known as

A

Baker Nathen effect

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16
Q

H.C prop to

A

No of α H
stability of C+
3>2>1*

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17
Q

Electromeric effect

A

If attacking reagent comes to same C, to which the π e’s migrate, it is +E effect, otherwise -E effect

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18
Q

Huckel’s rule

A

Cmpd must be cyclic, planar, conjugated, have 4n+2 π e’s

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19
Q

Effects order

A

Aromatic>+R>+HC>+I

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20
Q

Carbenes

A

Neutral e’ deficient reactive

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21
Q

Polar protic solvents

A

Solvent which can give H+ like ROH, H2O, RCOOH

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22
Q

Sublimable solids

A

Camphor, iodine, benzoic acid, phthalic acid, indigo, anthracene, hexachloroethane

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23
Q

Non sublimable solids

A

sand and salt

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24
Q

Benzoic acid & napthalene can be separated by

A

crystallisation

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25
Q

salicylic acid & aspirin can be separated by

A

Crystallization

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26
Q

Anthracene & urea can be separated by

A

crystallization

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27
Q

If very little OC is in large vol of solu we use

A

differential extraction

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28
Q

Benzene & nitrobenzene can be separated by

A

simple distillation

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29
Q

acetone & propanol can be separated by

A

simple distillatio

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30
Q

For simple distillation

A

cmpd should be volatile, no decomposition at high T, large diff in BP

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31
Q

If diff in BP is low we use

A

fractional distillation

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32
Q

For fractional distillation

A

cmpd must be volatile, no decom at high T, BP diff must be less

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33
Q

Crude oil can be separated by

A

Fractional distil

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34
Q

amines can be separated by

A

Fractional distil

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35
Q

ethanol & acetone can be separated by

A

fractional distil

36
Q

If cmpd decomposes at high T, we use

A

Steam distil

37
Q

For steam distil,

A

cmpd must be steam volatile, immiscible with water

38
Q

salicylaldehyde & p hydroxybenzaldehyde can be separated by

A

steam distil

39
Q

essential oils can be separated by

A

steam distil

40
Q

If cmpd is not steam volatile & immiscible with water we use

A

distillation under reduced press or vacuum distil

41
Q

Glycerol in spentlye can be separated by

A

vacuum disil

42
Q

sugar can be separated by

A

vacuum disil

43
Q

Column chromatography is

A

acc to gravity

44
Q

Thin layer chromatography is

A

against gravity like capillary rise

45
Q

Adsorbent

A

site at which adsorption takes place

46
Q

adsorbent eg

A

SiO2, Al2O3, TiO2, starch, charcoal

47
Q

Adsorbate

A

particles undergoing adsorption

48
Q

Stationary phase

A

adsorbents

49
Q

Mobile phase

A

solvent like benzene, toluene, CHCl3, CCl4

50
Q

Retention factor r(f) =

A

Dist travelled by each component/dist travelled by solvent front from baseline

51
Q

Partition chromatography

A

water act as stationary phase

52
Q

Amino acids can be separated by

A

partition chrom

53
Q

proteins can be separated by

A

partition chrom

54
Q

Visualizing agents

A

UV lamp, I2 vapours in I2 chamber

55
Q

test for C & H

A

OG + CuO gives CO2 + H2O turns lime water milky and forms blue ppt of CuSO4.5H2O

56
Q

Lassaigne’s test for

A

N,S,X

57
Q

Lassaigne’s test

A

OC + Na gives NaCN/Na2S/NaX/NaSCN

58
Q

For N

A

Prussian blue ppt of Fe4[FeCN6] from NaCN

59
Q

Which doesn’t give blue ppt

A

Diazonium salt, diazomethane, hydrazine, NH2OH

60
Q

For S

A

Na2S + CH3COOH with sodium nitroprusside gives purple sod. thionitroprusside
with Pb(CH3COO)2 gives black PbS
with Cd(CH3COO)2 gives yellow CdS

61
Q

For X

A

AgCl gives white with AgNO3 - soluble
AgBr gives pale yellow - partially soluble
AgI - yellow - insoluble

62
Q

For elimination of CN & S

A

NaCN/Na2S + HNO3 boil

63
Q

NaSCN with CH3COOH + FeCl3

A

Blood red ppt [FeSCN]2+

64
Q

For C & H

A

Liebig

65
Q

For N

A

Duma’s & Kjeldahl’s method

66
Q

CxHyNz + CuO heat gives

A

xCO2 + y/2H2O + z/2N2

67
Q

Vstp =

A

[P(T) - P(H2O)]V1 x 273/760xT1

68
Q

%N =

A

28/22400 x Vstp(mL) x 100/W

69
Q

Limitation of Kjeldahl’s method

A

Can’t estimate nitrobenzene, azo & diazo cmpds

70
Q

For X

A

Carius method

71
Q

%X

A

At. wt of X x W(AgX) x 100/MM of AgX x W(oc)

72
Q

For S

A

Carius method

73
Q

%S

A

32xW(BaSO4)x100/233W(oc)

74
Q

%P

A

31W(o)x100/1877W(oc)

75
Q

BP prop

A

No of C

76
Q

Reactivity of H prop

A

stability of free radical(3>2>1*)

77
Q

Reactivity of X

A

F2>Cl2>Br2>I2

78
Q

Which will only react with KMnO4 to give alcohol

A

3* alc

79
Q

n-hexane to benzene

A

Cr2O3 773K, 10-20atm

80
Q

Stability of conformations

A

Staggered>skew>eclipsed

81
Q

CaC2 + H2O

A

CHCH

82
Q

alkynes stability

A

3>2>1*

83
Q

CHCH to C6H6

A

red hot Fe 873K

84
Q

C6H6 to Gammahexane

A

3Cl2 hν/500K

85
Q

Gammahexane also called

A

Lindane

KEAM (16 decks)

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