Synthesis A2 Flashcards by Lucy Roberts-Clark | Brainscape

Q

Test for C=C bond

A

bromine water

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Q

positive result for bromine water

A

yellow/orange to colourless

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Q

negative result for bromine water

A

stays yellow/orange

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Q

test for primary and secondary alcohols

A

acidified potassium dichromate

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Q

positive result for potassium dichromate

A

orange to green

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Q

negative result for potassium dichromate

A

stays orange

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Q

what conditions are for an acidified potassium dichromate test

A

aqueous sulphuric acid + K2Cr3O7 + heat

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Q

what does a tollen’s reagent test for

A

aldehydes

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Q

positive result for tollen’s reagent

A

silver mirror

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Q

negative test for a tollen’s reagent

A

no change

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Q

conditions for a tollen’s reagent

A

NH3, NaOH, AgNO3, [Ag(NH3)2] and warm

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Q

what does a Fehling’s solution test for

A

aldehyde

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Q

positive test for a Fehling’s solution

A

blue solution to red/orange solid

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Q

negative test for a Fehling’s solution

A

stays blue

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Q

conditions for a Fehling’s solution

A

Cu2+ and warm

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Q

what does sodium hydrogen carbonate test for

A

carboxylic acid

Q

positive test for a carboxylic acid

A

bubbles of gas/fizzing

Q

negative test for a carboxylic acid

A

no reaction

Q

molecular formula of sodium hydrogen carbonate

A

NaHCO3

Q

test for a haloalkene

A

hydrolysis followed by acidified AgNO3

Q

conditions for test for haloalkane

A

warm with NaOH and add AgNO3

Q

positive results for test for chloroalkane

A

white solid

Q

positive results for test for bromoalkane

A

cream solid

Q

positive result for test for iodoalkane

A

yellow solid

Q

negative result for test for haloalkane

A

no reaction

Q

test for acyl chloride

A

hydrolysis

Q

conditions for test for acyl chloride

A

add H2O

Q

positive result for test for acyl chloride

A

white fumes

Q

negative results for test for acyl chloride

A

no reaction