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Chm 108 > All Topics > Flashcards

All Topics Flashcards

1
Q

In terms of density which organic compounds form the upper layer

A

Benzene and Toluene

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2
Q

Which organic compounds form the lower layer

A

Chloroform
Carbon tetrachloride
Chlorobenzene

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3
Q

Nitro-compound are what color

A

Pale-yellow

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4
Q

Carbon, Oxygen, and Hydrogen are characterised with what colour

A

Colourless

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5
Q

Amines are grouped into

A

Primary
Secondary
Tertiary

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6
Q

A foul odour or smell resulting from Isocyanide emission indicates the presence of

A

Amine or amine compound.

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7
Q

If there is a formation of violet red colour it indicates

A

The presence of Aliphatic primary amine

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8
Q

Aromatic and aliphatic compounds burn with…

A

Sooty flame and Non-sooty flame, respectively.

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9
Q

Which compounds have the following odour..
Characteristic aromatic smell
Fruity
Pungent penetrative smell
Smell of bitter almonds

A

Benzene, Toluene
Esters (lipids)
Formaldehyde, Acetadelhyde,formic acid
Benzaldehyde, Nitrobenzee

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10
Q

The following compounds are characteristized by what odour.
. Acetic acid
. Thioalcohols
. Compound alcohols
. Aliphatic and aromatic compounds
. Phenols,cresols

A

Vinegar
Garlic
Wine like
Fishy
Carbolic

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11
Q

The following compounds have what odour
Tertiary amines
Chloroform
Methyl-salicynate
Acetamide

A

Ammonical
Sweet
Oil of winter green
Mice

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12
Q

The tests for saturation and unsaturation are

A

Baeyer’s reagent: If the pink colour is discharged, the given compound is unsaturated
Decolourization of Br water: with the addition of the organic compound, it shows unsaturation of the compound.

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13
Q

Chloroform, carbon tetrachloride and ethylacetate which are aliphatic compounds burn with

A

A sooty flame

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14
Q

On addition of few drops of a saturated aqueous soln of NaHco3 to the aqueous or alcoholic solution of the substance in a wash glass……..

A

An evolution of bubbles indicates the presence of a Carboxylic Acid

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15
Q

When Carboxylic acids reacts with sodium dicarbonate solution what is evolved

A

Co2 is evolved

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16
Q

Carboxylic aids reacts with bases such as Naoh to form …..
What type of reaction is it called

A

Water-soluble Carboxylate salt
Acid-base Neutralisation reaction

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17
Q

On addition of one drop of Ferric-chloride (Fecl²) what colour change is observed

A

An intense colouration is observed and it indicates that the substance is a Phenol or contains a phenolic group.

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18
Q

In the reaction of alcohol, Ethanoic chloride reacts instantly with cold ethanol…..

A

It is an exothermic reaction in which an acidic gas (Hydrogen chloride) is given up. Ethylethanoate is formed

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19
Q

Conc H²SO⁴ in esterification reaction acts as what

A

As a catalyst and dehydrating agent to help in the removal of water formed in the reaction which will favor the forward rxn.

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20
Q

What in esterification?

A

Carboxylic Acid(RCOOH) reacts with an alcohol(ROH) ro form an ester(RCOOR’) and water.

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21
Q

In the test for ketone and aldehyde what reagent Is used

A

2,4- dinitrophenyl hydrazine

22
Q

PPT formed after using 2,4- dinitrophenyl hydrazine indicates

A

The presence of aldehyde or ketone

23
Q

A positive test is indicated by a yellow, orange, reddish-orange ppt known as

A

Dinitrophenyl hydrazone

24
Q

Ketone can be reduced to secondary alcohols with

A

Lithium aluminium hydride (LiAlH⁴)

25
Q

Primary and secondary alcohols are readily oxidised on heating to

A

Aldehyde and ketone respectively

26
Q

Common oxidising agents are

A

K²Cr²O⁷
Kmno⁴

27
Q

In the oxidation alcohols aldehyde is oxidised to

A

Carboxylic acid

28
Q

In the test for alcohols with acidified Kmno⁴,
No colour change …
Permanent pink colour…
Colour changes occur without production of permanent pink colour…

A

Alcohol is a tertiary alcohol
Alcohol is a secondary Alcohol
Alcohol is a primary alcohol

29
Q

The liberation of a gas with the characteristic smell of Ammonia indicates the presence of

A

A simple amide

30
Q

Precipitate below the solvent in a test tube is because of

A

Specific gravity

31
Q

Using Blue Fehlings solution test in the test for aldehyde what is the indication

A

Formation of a yellow or orange-red ppt indicates the presence of aldehyde.

32
Q

Using Ammonical Silver Nitrate for the test for aldehydes what is then indication

A

Formation of a silver mirror or black ppt indicates the presence of aldehyde functional group.

33
Q

What is the reagent involved in silver mirror test

A

Tollen’s reagent

34
Q

Tollen’s reagent consists of

A

Silver-nitrate
Ammonium Hydroxide
Sodium Hydroxide

35
Q

Amongst salt and aldehyde, which of them is oxidised by Tollen’s reagent

A

Aldehydes

36
Q

What are the tests for aldehydes

A

Fehling’s solution test
Tollen’s reagent

37
Q

What are the tests for ketones

A

The test with sodium nitroprusside
The tests with sodium Bisulphite

38
Q

On adding 1-2ml of aqueous soln of sodium nitroprusside to the organic compounds and then making it alkaline with sodium Hydroxide. What is the indication for a ketone group

A

A formation of red or violet colour indicates the presence of a ketone group.

39
Q

In the addition 1ml of sodium bisulphite to an organic compound. What is the indication a ketone group ?

A

The white ppt shows the presence of a ketone group

40
Q

Melting and boiling points are associated with what respectively

A

Solid and liquids

41
Q

What can be used to measure the purity of a organic compound

A

Melting point

42
Q

What lowers the melting point of solid

A

Impurities

43
Q

Melting point of paraffin is

A

1689°c

44
Q

Pure benzoic acid melts at

A

122.3°c

45
Q

In the test for hydrocarbon, on addition of conc H²SO⁴ to the organic compound, and then shaking, what is the indication for hydrocarbon

A

The organic compound is immscible or insoluble in H2SO4.

46
Q

What is the boiling point of ethyl alcohol is

A

78°C

47
Q

A pungent smell of Acetaldehyde indicates

A

Ethanol

48
Q

When adding potassium dichromate to an organic compound. What test is it

A

Test For ethyl alcohol and isopropyl alcohol.

49
Q

The boiling point of isopropyl alcohol is

A

82°C

50
Q

On adding potassium dichromate to an organic compound, a pleasant smell of Acetone indicates

A

IPA(Isopropyl Alcohol)

Chm 108 (1 decks)

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