REVISION LESSON: CHEMICAL TEST (SK025)

Which of the following will be formed when 2-butene reacts with cold alkaline KMnO₄?

• I ONLY

• I & II ONLY

• II & III ONLY

• I, II & III

Ethene and ethane can be differentiated by using

• Acidified KMnO₄

• Br₂, CH₂Cl₂ in the absence of light or heat

• Concentrated sulphuric acid, H₂SO₄

• 2,4-Dinitrophenylhydrazine

When aqueous iron(III) chloride is added to phenol,

• Chlorobenzene is formed

• White fumes are given off

• A purple solution is formed

• Iron (III) is reduced to iron (II)

Which of the following is formed when bromine water is added to phenol?

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Which of the following is expected to give a yellow precipitate when reacted with an alkaline iodine solution?

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Oxidation of 2-butanol produces compound X. X is expected to........

You may choose more than one answer

• Give an orange precipitate with Brady's reagent

• Give a negative reaction with Tollen's reagent

• Gives a yellow precipitate with an alkaline iodine solution

When bromine water is added to phenol,

• White fumes produces

• A white precipitate is formed

• The reddish brown colour of bromine is decolourised

Both ethanal and propanone will give the SAME observation with....

(You may choose more than one answer)

• Alkaline iodine solutions

• Silver diamine complex solution

• Fehling's solution

• 2,4-dinitrophenylhydrazine

An organic compound X has the following chemical properties:

Produce brick-red precipitate when reacted with Fehling's solution

Forms a silver mirror precipitate with an ammoniacal solution of silver nitrate

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Which of the following can be used to differentiate between ethanal and other aldehydes?

• Hot alkaline Cu²⁺ solution

• Tollen's reagent

• 2,4-dinitrophenylhydrazine

• Alkaline iodine solution