ph-CHO  +   2 $\stackrel{{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }$ major product of this reaction is:

(a) ph₃CH

(b) $OH$
$|$
$Ph-C-Ph$
$|$
$Ph$

(c) 

(d) ph₂CH₂

$\underset{\left(2\right) {\mathrm{H}}_3{\mathrm{O}}^{\oplus }}{\overset{\left(1\right) {\mathrm{KMnO}}_4, {\mathrm{HO}}^{-}, ∆}{\to }}$

The labelled carbon goes with:

$1. \mathrm{Ph}-\stackrel{14}{\mathrm{C}}{\mathrm{O}}_2\mathrm{H}$
$2. \stackrel{14}{\mathrm{C}}{\mathrm{O}}_2$
$3. \mathrm{Ph}-\stackrel{14}{\mathrm{C}}{\mathrm{H}}_2-{\mathrm{CO}}_2\mathrm{H}$
$4. \stackrel{14}{\mathrm{C}}{\mathrm{H}}_4$

Which of the following acid gives positive Tollen's reagent test.

(1) $({\mathrm{CH}}_2{)}_2{<}_{{\mathrm{CO}}_2\mathrm{H}}^{{\mathrm{CO}}_2\mathrm{H}}$           

(2) ${\mathrm{CH}}_2{<}_{{\mathrm{CO}}_2\mathrm{H}}^{{\mathrm{CO}}_2\mathrm{H}}$           

(3) $\underset{|}{\mathrm{C}}{\mathrm{O}}_2\mathrm{H}$
${\mathrm{CO}}_2\mathrm{H}$

(4) HCO₂H

Acetaldehyde and benzaldehyde can be differentiated by:

1. Fehling test

2. Iodoform test

3. Tollen's reagent

4. Both (1) and (2)

PCl₅ reacts with propanone, to give:

1. gem dichloride

2. vic dichloride

3. propanal

4. propane chloride

When vapours of acetic acid are passed over.....at $300°\mathrm{C}$ we get acetone.

1. ${\mathrm{Al}}_2{\mathrm{O}}_3$

2. $\mathrm{CuO}$

3. $\mathrm{MoO}$

4. $\mathrm{Cu}$

Formaldehyde is not used in:

(1) adhesives                 

(2) bakelite

(3) tooth powders           

(4) explosives

Ketones can be prepared by:

(1) Rosenmund's reduction

(2) Stephen's reduction

(3) both (1) and (2)

(4) none of the above

Cyclohexanone is subjected to reduction by ${\mathrm{NaBH}}_4$. The product formed is:

(1) cyclohexane             

(2) cyclohexanal

(3) cyclohexadiene         

(4) Cyclohexanol

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