SK025: CHEMICAL TEST OF ORGANIC CHEMISTRY (LEVEL 2)

Compound A, give positive result if react with bromine in carbon tetrachloride. Predict the compound A.

• 2-butanol

• 2-butene

• 2-butanone

• butane

Compound X can't oxidise if react with acidified potassium permanganate heated but immediately cloudy after react with concentrated

hydrochloric acid and anhydrous zinc chloride. Predict compound X.

• 1-butanol

• 2-butanol

• 2-methyl-2-butanol

• 2-methyl-1-butanol

Compound AA give silver mirror precipitate after react with aqueous ammonium

silver nitrate. Predict compound AA?

• 2-butene

• 2-butanone

• butanal

• butanoic acid

Compound W give positive result after react with 2,4-DNPH but can't react with tollens' reagent. Predict the compound W.

• pentanal

• 2-pentanol

• 2-pentanone

• pentane

Compound G can be react with excess alkaline iodine to give positive result, and cloudy solution formed within 5-10 minutes after react with Lucas reagent's. Predict compound G.

• 1-pentanol

• 2-pentanol

• 3-pentanol

• 2-methyl-2-pentanol

Compound H (C₆H₆O) show white precipitate formed after react with bromine solution. Predict structure H.

• Aniline

• Benzoic acid

• Phenol

• Toluene

Structure G can be react with alkaline potassium permanganate in cold condition to give purple colour of KMnO4 decolorised and brown precipitate. Predict structure G.

• cyclobutane

• cyclobutanol

• cyclobutene

• cyclobutanone

Structure A release gas nitrogen after react with nitrous acid. Predict structure A.

• 1-butanamine

• N-methyl-2-propanamine

• aniline

• N-methylaniline

Compound K give positive result after react with Cu²⁺ ion in basic medium and alkaline excess iodine. Predict compound K.

• ethanal

• propanone

• butanal

• butanone

Compound HH is added to alkaline

solution of benzenesulphonyl chloride, two layers

are form which dissolve upon acidification. Predict compound HH.

• 1-propanamine

• N,N-dimethyl-1-propanamine

• N-methyl-1-propanamine

• N-methyl-2-propanamine