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OCR Chemistry A > Analysis > Flashcards

Analysis Flashcards

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1
Q

Alkenes

A

Bromine water decolourises

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2
Q

Haloalkanes

A

Silver nitrate + ethanol, 50’C
Cl=white ppt.
Br=cream coloured ppt.
I=yellow ppt.

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3
Q

Phenols

A

Reacts with Na &NaOH
or
add X2, white ppt forms

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4
Q

Carboxylic Acids

A

add aq. sodium carbonate (Na2CO3)

effervescence turns limewater cloudy

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5
Q

Carbonyl

A

add 2,4-DNP dissolved in Sulfuric acid, water and methanol
orange precipitate forms
find m.p for exact molecule

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6
Q

Aldehyde

A

Tollen’s Reagent (Silver Nitrate Soln.= NaOH + dilute. Ammonia soln.)
50°C water bath
Silver mirror forms

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7
Q

Primary/secondary alcohol

A

K2CR2O7/H2SO4, warm

orange ->green

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OCR Chemistry A (5 decks)

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