Which one is the most acidic compound ?

The reaction 

can be classified as

1. Alcohol formation reaction

2. Dehydration reaction

3. Williamson alcohol synthesis reaction

4. Williamson ether synthesis reaction

Among the following ethers, the one that will produce methyl alcohol on treatment with hot concentrated HI is:

1.		2.
3.		4.

Reaction of phenol with chloroform in the presence of dilute sodium hydroxide finally

introduces, which one of the following functional group?

1. -CH₂Cl                       

2. -COOH

3. -CHCl₂                       

4. -CHO

Identify A, X, Y and Z 

(1) A-methoxymethane, X-ethanoic acid, Y-acetate ion, Z-hydrazine

(2) A- methoxymethane, X-ethanol, Y-ethanoic acid, Z- semicarbazide

(3) A-Acetaldehyde, X-ethanol, Y-but-2-en-1-ol, Z- semicarbazone

(4) A-ethanol, X-acetaldehyde, Y-butanone, Z-hydrazone

The reaction:

${\mathrm{CH}}_3-\stackrel{{\mathrm{CH}}_3}{\stackrel{|}{\mathrm{CH}}}-{\mathrm{CH}}_2-\mathrm{O}-{\mathrm{CH}}_2-{\mathrm{CH}}_3<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>\mathrm{HI}<mspace\; width="1em"></mspace>\stackrel{\mathrm{heated}}{\to }?$

Which of the following compounds will be formed?

(1) ${\mathrm{CH}}_3-\stackrel{\stackrel{{\mathrm{CH}}_3}{|}}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_2-\mathrm{I}+{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}$

(2) ${\mathrm{CH}}_3-\underset{\underset{{\mathrm{CH}}_3}{|}}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_3+{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}$

(3) ${\mathrm{CH}}_3-\underset{\underset{{\mathrm{CH}}_3}{|}}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_2\mathrm{OH}+{\mathrm{CH}}_3{\mathrm{CH}}_3$

(4) ${\mathrm{CH}}_3-\stackrel{\stackrel{{\mathrm{CH}}_3}{|}}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_2\mathrm{OH}+{\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{I}$

Which of the following is not the product of dehydration of

1. 

2. 

3. 

4. 

H₂COH.CH₂OH on heating with periodic acid gives :-

1. 2CO₂       

2. 2HCOOH       

3. CHO-CHO     

4.         
                                    

Acetophenone when reacted with a base, C₂H₅ONa, yields a stable compound which has the structure