3.8 Aldehydes and Ketones Flashcards Preview

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Flashcards in 3.8 Aldehydes and Ketones Deck (13):
1

What is meant by a carbonyl compound?

The functional group revolves around C=O

2

What is the functional group of an Aldehyde?

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3

What is the functional group of a Ketone?

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4

What happens when K2Cr2Ois added to an Aldehyde?

The Aldehyde would be Oxidised, turning from an Orange colour to Green

5

What happens when K2Cr2O7 is added to an Ketone?

Nothing because the Ketone cannot Oxidise further. 

6

Why can you not oxidise a Ketone further?

It would require breaking a C-C bond rather than a C-H bond which requires high amount of energy only able to do in combustion

7

How does Tollens Reagent form a Silver Mirror?

 

How is Tollens Reagent reduced?

Ag (NH3)2+ (aq) + e- -> Ag (s) +2NH3

8

How does Tollens Reagent react with Aldehydes and Ketones?

Aldehydes form a silver mirror as they can be further oxidised

 

Ketones dont cause any change as they have no further oxidation

9

How is Fehling's solution reduced?

 

How does Fehlings Solution react?

Cu2+ (aq) + e- -> Cu+

 

The Cu+ ions give the colour

10

How do Aldehydes and Ketones react with Fehlings Solution?

Aldehydes turn from Blue solution to Red due to the free floating Cu ions. 

 

Ketones remain a Blue solution as they cannot further oxidise

11

What is NaBH4?

Sodium Hydro Tetra Borate

A source of Hydride H- ions

The ions act as Nucleophiles- a lone pair donator

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12

What is a Racemic Mixture?

 

What is a Racemate?

 

A mixture of  left and right handed enantiomers of a chiral molecule

13

What is an enantiomer?

Stereoisomers that are non-super imposable mirror images. 

For example, molecules with 1 Chiral Carbon

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