In Tischenko's reaction an aldehyde is heated with catalyst:

(1) NaOH

(2) Al(OC₂H₅)₃

(3) Al₂O₃

(4) Mg/Hg

Formalin is:

1. Formaldehyde

2. Formaldehyde+methanol

3. Formaldehyde+methanol+water

4. Formaldehyde+water

Doctors detect diabetes disease by testing the presence of glucose in urine with:

(1) Nessler's reagent

(2) Fehling's solution

(3) Fenton's reagent

(4) Silver nitrate solution

Acetals are:

1. Aldehyde

2. Diethers

3. Ketones

4. Hydroxy aldehyde

The correct order of reactivity of >CO group in given compounds is:

(1) 

(2) 

(3) 

(4) 

Ketones are first oxidation product of:

(1) primary alcohols

(2) secondary alcohols

(3) dilhydric alcohols

(4) trihydric alcohols

Alkaline hydrolysis of R₂C.Cl₂ forms:

(1) propanone

(2) propane

(3) alkanone

(4) alkanal

Ketones are prepared by:

1. Clemmensen's reduction

2. Rosenmund's reduction

3. Oppeanauer's oxidation

4. Cannizzaro's reaction

Chlorine does not react with:

(1) methanal 

(2) CH₃CHO

(3) propanone

(4) C₆H₅CHO

Both acetaldehyde and ketone react with:

(1) ammoniacal AgNO₃

(2) rochelle salt

(3) 2,4-dinitro phenylhydrazine

(4) all of the above