reagents

potassium manganate(VII),_________, solution is __________, it is strong oxidising reagent

• KMnO₄, purple

• KMnO₄,colorless

• K₂MnO₄,purple

• K₂MnO₄, colorless

the solution of potassium dichromate(VI),___________, is_________, and it is strong __________reagent

• K₂Cr₂O₇, orange, oxidising

• K₂Cr₂O₇, green, oxidising

• K₂Cr₂O₇, puerple, oxidising

• K₂CrO₄, orange, oxidising

which compounds are reducing reagents ？

• NaBH₄

• LiAlH₄

• KMnO₄

• K₂Cr₂O₇

when a compound that contains C=C, react with bromine water,Br₂(aq), the color of solution turns from _________ to _________

• purple, colorless

• orange, green

• brown, colorless

when a compound that contains C=C, react with acidifide potassium manganate(VII), the color of solution turns from _________ to _________

• purple , colorless

• orange , green

• brown, colorless

when a compound that contains -CHO, reacts with Tollens' reagent, what we will observe ?

• silver mirror

• orange precipitate

which substances we need,when preparing the Tollen's reagent

• silver nitrate,AgNO₃

• sodium hydroxide,NaOH

• ammonia solution

2,4-DNPH can react with _____________,to form orange ppt.

• aldehyde

• ketone

• ester

• carboxylic acid

which solution will give a positive result when mix with ethene

• KMnO₄,H⁺

• Br₂(aq)

• 2,4-DNPH

• Tollen's reagent

which solution will give a positive result when mix with ethanal

• acidifide potassium manganate

• 2,4-DNPH

• Tollen's reagent