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Test 18. Responses of Aldehydes and Ketones. Presentation. Aldehydes and ketones are carbonyl compoundsUndergo comparative sorts of responses
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Slide 1

Trial Reports Today is the last commonsense Get dry weights for % yield, liquefying focuses by one week from now All reports must be given up to your demonstrators no later than one week from today – generally checks will be lost

Slide 2

Experiment 18 Reactions of Aldehydes and Ketones

Slide 3

Introduction Aldehydes and ketones are carbonyl mixes Undergo comparable sorts of responses – option, buildup and substitution responses Aldehydes more receptive then ketones

Slide 4

Introduction Aldehydes can be oxidized, ketones can not be oxidized Fehlings test utilizes this standard to distiguish between the two sorts of compound Accompanied by arrangement of a red encourage

Slide 5

Fehlings Test Aldehydes oxidized to carboxylic acids Ketones not oxidized Precipitate because of development of insoluble Cu +1 as Cu 2 O – shows nearness of aldehyde

Slide 6

Derivative Formation One subsidiary of every class of compound will be readied A semicarbazone subordinate of a ketone will be shaped A phenylhydrazone subsidiary of an aldehyde will be framed

Slide 7

Nucleophilic Addition Reaction Addition of semicarbazine/hydrazine reagent to the carbonyl compound outcomes in semicarbazone/hydrazone development Imine useful gathering is shaped

Slide 8

Hydrazone development

Slide 9

Experimental – Fehlings Test To 6 drops of Fehlings arrangement in a test tube include 3 drops of propanal Heat in the water shower for 2 mins Red accelerate showed oxidation of aldehyde Repeat with butanone – record perceptions & remark on the outcomes

Slide 10

Experimental – Semicarbazone Formation Dissolve 2.0 g of semicarbazide hydrochloride and 2.0 g of sodium acetic acid derivation in 10 ml water Add 2 ml butanone and warmth for 15 min on the water shower Cool to room temperature & gather the rough precious stones

Slide 11

Experimental – Semicarbazone Formation Wash with water Recrystallise from watery ethanol Allow to dry on the Hirsch channel Record the yield in g, the softening point, and % yield of the dry gems Include an instrument for the response in your trial report

Slide 12

Experimental – hydrazone arrangement To 1.0 ml of propanal include 10 ml ethanol and 25 ml of the 2,4-dinitrophenylhydrazine arrangement Heat for 5 mins and permit to cool Isolate the gems on the Hirsch pipe Allow to dry, record the yield in g, the dissolving point and % yield of gems

Slide 13

Report Introduction Observsations & conclusions from Fehlings tests & subordinate development % yield & mp of semicarbazone Mechanism of semicarbazone development % yield & mp of phenylhydrazone Discussion of all outcomes and responses

Slide 14

Experimental Reports Today is the last down to earth Get dry weights for % yield, softening focuses by one week from now All reports must be given up to your demonstrators no later than one week from today – generally stamps will be lost

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