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Chemistry > Organic Analysis > Flashcards

Organic Analysis Flashcards

1
Q

What is the fingerprint region in infrared spectroscopy?

A

A region under 1500 wave numbers.

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2
Q

If a compound dissolves in water, what does it suggest about its polarity?

A

It is a polar group.

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3
Q

How do you test for an Alkene?

A

Shake sample with bromine water.

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4
Q

What is the positive and negative result of a chemical test for Alkenes?

A

P - orange colour disappears

N - remains orange

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5
Q

How do you test for a halogenoalkane?

A

1) Add NaOH(aq) and heat
2) Acidify with HNO3
3) Add AgNO3(aq)

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6
Q

What is the positive result of a halogenoalkane chemical test?

A

Precipitate of Silver halogen

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7
Q

How do you test for an alcohol?

A

Add acidified K2Cr2O7.

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8
Q

What is the positive and negative result of a chemical test for alcohol?

A

Positive - orange colour turns green with primary or secondary alcohol (and aldehydes).
Negative - orange

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9
Q

How do you test for an aldehyde?

A

Warm with Fehling’s solution or Tollens’ solution.

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10
Q

What is the positive result for Fehling’s test?

A

Blue colour turns to red ppt

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11
Q

What is the positive result for Tollens’ test?

A

Silver mirror forms

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12
Q

What is the chemical test to detect carboxylic acids?

A

Add NaHCO3(aq)

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13
Q

What is the positive result of the chemical test for carboxylic acids?

A

CO2 is produced

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14
Q

How do you test for an alkene (C=C)?

A

Shake with bromine water
Positive - clear
Negative - stays orange

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15
Q

How do you test for a halogenoalkane (R-X)?

A

1) add Sodium Hydroxide (aq) and warm solution
2) acidify with nitric acid (HNO3)
3) add silver nitrate (aq)

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16
Q

What the positive result of a halogenoalkane test?

A

Precipitate of AgX (Cl, Br, I)

Nothing (F)

17
Q

How do you test for an alcohol?

A

Add acidified potassium dichromate.

18
Q

What the positive result of an alcohol test?

A

Orange colour turns green with primary and secondary alcohols and with aldehydes.

19
Q

How do you test for aldehydes? (R-CHO)

A

Warm with Fehling’s solution

or

Warm with Tollens’ solution

20
Q

What’s the positive result for an aldehyde test?

A

Fehling’s - blue colour turns to red precipitate

Tollens’ - silver mirror forms

21
Q

How do you test for carboxylic acids? (R-COOH)

A

Add sodium hydrocarbonate (NaHCO3(aq))

22
Q

What’s the positive result for a test for carboxylic acids?

A

CO2 is given off.

Chemistry (22 decks)

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