aldehydes and ketones

aldehydes-and-ketones

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388096

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reagent in Reduction of carbonyls

NaBH4 In aqueous ethanol

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{"id":1727547,"question_id":"388096","created_at":"2018-02-23 16:14:51","updated_at":"2018-02-23 16:14:51","answerTitle":"NaBH4 In aqueous ethanol","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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388039

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racemic mixture

Equal mixture of enantiomers

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{"id":1727289,"question_id":"388039","created_at":"2018-02-23 14:34:48","updated_at":"2018-02-23 14:34:48","answerTitle":" Equal mixture of enantiomers","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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388040

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State the relationship between two chiral molecules with the same structural formula.

Non-superimposable mirror images

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{"id":1727290,"question_id":"388040","created_at":"2018-02-23 14:36:07","updated_at":"2018-02-23 14:36:07","answerTitle":"Non-superimposable mirror images","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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388085

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Intermolecular forces in Carbonyls

Pure carbonyls cannot hydrogen bond, but bond instead by permanent dipole forces

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{"id":1727533,"question_id":"388085","created_at":"2018-02-23 16:06:54","updated_at":"2018-02-23 16:06:54","answerTitle":"Pure carbonyls cannot hydrogen bond, but bond instead by permanent dipole forces","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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388086

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ketone

If the C=O is in the middle of the chain it is a ketone The name will end in one

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{"id":1727534,"question_id":"388086","created_at":"2018-02-23 16:08:01","updated_at":"2018-02-23 16:08:01","answerTitle":"If the C=O is in the middle of the chain it is a ketone The name will end in one","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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388087

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what are carbonyls?

Carbonyls are compounds with a C=O bond. They can be either aldehydes or ketones

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{"id":1727548,"question_id":"388087","created_at":"2018-02-23 16:16:16","updated_at":"2018-02-23 16:16:16","answerTitle":"Carbonyls are compounds with a C=O bond. They can be either aldehydes or ketones","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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388088

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Solubility in water for carbonyl compounds

The smaller carbonyls are soluble in water because they can form hydrogen bonds with water

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{"id":1727536,"question_id":"388088","created_at":"2018-02-23 16:09:13","updated_at":"2018-02-23 16:09:13","answerTitle":"The smaller carbonyls are soluble in water because they can form hydrogen bonds with water","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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388089

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why is the C=O bond polarised

O is more electronegative than carbon. The positive carbon atom attracts nucleophiles.

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{"id":1727537,"question_id":"388089","created_at":"2018-02-23 16:09:56","updated_at":"2018-02-23 16:09:56","answerTitle":"O is more electronegative than carbon. The positive carbon atom attracts nucleophiles.","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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388090

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what is the reagent that causes alcohols and aldehydes to oxidise

Potassium dichromate K2Cr2O7 is the oxidising agent

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{"id":1727541,"question_id":"388090","created_at":"2018-02-23 16:11:11","updated_at":"2018-02-23 16:11:11","answerTitle":"Potassium dichromate K2Cr2O7 is the oxidising agent","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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388091

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aldehyde ----> carboxylic acid

Reagent: potassium dichromate (VI) solution and dilute sulphuric acid. Conditions: heat under reflux

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{"id":1727542,"question_id":"388091","created_at":"2018-02-23 16:11:52","updated_at":"2018-02-23 16:11:52","answerTitle":"Reagent: potassium dichromate (VI) solution and dilute sulphuric acid. Conditions: heat under reflux","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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388092

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observation when an aldehyde is reduced to a carboxylic acids

the orange dichromate ion (Cr2O7 2-) reduces to the green Cr 3+ ion

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{"id":1727543,"question_id":"388092","created_at":"2018-02-23 16:12:59","updated_at":"2018-02-23 16:12:59","answerTitle":" the orange dichromate ion (Cr2O7 2-) reduces to the green Cr 3+ ion","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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388093

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how is Tollen’s Reagent formed

by mixing aqueous ammonia and silver nitrate.

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{"id":1727544,"question_id":"388093","created_at":"2018-02-23 16:13:36","updated_at":"2018-02-23 16:13:36","answerTitle":"by mixing aqueous ammonia and silver nitrate.","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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388094

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tollens reagent

Observation: with aldehydes, a silver mirror forms coating the inside of the test tube. Ketones result in no change.

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{"id":1727545,"question_id":"388094","created_at":"2018-02-23 16:13:58","updated_at":"2018-02-23 16:13:58","answerTitle":"Observation: with aldehydes, a silver mirror forms coating the inside of the test tube. Ketones result in no change.","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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388095

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Fehling’s solution

Blue Cu 2+ ions in solution change to a red precipitate of Cu2O. Ketones do not react.

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{"id":1727546,"question_id":"388095","created_at":"2018-02-23 16:14:25","updated_at":"2018-02-23 16:14:25","answerTitle":"Blue Cu 2+ ions in solution change to a red precipitate of Cu2O. Ketones do not react.","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

aldehydes and ketones

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