Schiff's reagent is:

1. Magenta solution decolorized with sulphurous acid

2. Magenta solution decolorized with chlorine

3. Ammoinacal cobalt chloride solution

4. Ammoinacal manganese sulphate solution

Which of the following reaction is a condensation reaction?

(1) HCHO$\to$Para-formaldehyde

(2) ${\mathrm{CH}}_3\mathrm{CHO}\to$Paraldehyde

(3) ${\mathrm{CH}}_3{\mathrm{COCH}}_3\to$Mesityl oxide

(4) ${\mathrm{CH}}_2={\mathrm{CH}}_2\to$Polyethylene

Which of the following is correct for carbonyl compounds?

(1)              

(2) 

(3)                

(4) 

Compound having molecular formula ${\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O}$ may be:

(1) cyclic ether

(2) carbonyl compound

(3) unsaturatd ether or unsaturatd alcohol

(4) all of the above

Which of the following would undergo aldol condensation?

(1) $CC{l}_3$CHO               

(2) $C{H}_3$
$|$
$C{H}_3—C—CHO$
$|$
$C{H}_3$

(3) $C{H}_{3}C{H}_2$CHO          

(4) HCHO

Dry distillation of barium salt of Hexane-1,2-dicarboxylic acid gives :

(1)                    

(2) 

(3)                       

(4) 

Paraldehyde is:

(1) a trimer of formaldehyde

(2) a trimer of acetaldehyde

(3) a hexamer of formaldehyde

(4) a hexamer of acetaldehyde

Paraldehyde is used as a:

(1) saporific                   

(2) poison

(3) polymer                   

(4) dye

A typical compound undergoes Cannizzaro's reaction and aldol condensation. It is:

1. $(C{H}_3{)}_2$CHCHO       

2. HCHO

3. $C_6{H}_5$CHO             

4. $C{H}_3$CHO

Formaldehyde when treated with KOH gives methanol and potassium formate. The reaction is known as:

1. Perkin's reaction

2. Claisen's reaction

3. Cannizzaro's reaction 

4. Knoevenagel's reaction