Which one is the most acidic compound ?

The most acidic compound among the following is:

1.		2.
3.		4.

The below-mentioned reaction can be classified as:

1. Alcohol formation reaction

2. Dehydration reaction

3. Williamson alcohol synthesis reaction

4. Williamson ether synthesis reaction

In the reaction 
 
the electrophile involved is

1. Dichloromethyl cation $\left(\stackrel{\oplus }{\mathrm{C}}{\mathrm{HCl}}_2\right)$

2. Formyl cation $\left(\stackrel{\oplus }{\mathrm{C}}\mathrm{HO}\right)$

3. Dichloromethyl anion $\left(\stackrel{\oplus }{\mathrm{C}}{\mathrm{HCl}}_2\right)$

4. Dichlorocarbene (:CCl₂)

The heating of phenylmethyl ether with HI produces-

1. Iodobenzene

2. Phenol

3. Benzene

4. Ethyl chloride

The compound A on treatment with Na gives B, and with PCl₅ gives C. B and C react together to give diethyl ether.

A, B and C are respectively:

1. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH},$ ${\mathrm{C}}_2{\mathrm{H}}_6,$ ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}$

2. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH},$ ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl},$ ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{ONa}$

3. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl},$ ${\mathrm{C}}_2{\mathrm{H}}_6,$ ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$

4. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH},$ ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{ONa}$ $,{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}$

Identify A and predict the type of reaction
    

1.
2.
3.
4.

Identify A and predict the type of reactions


1.   and substitution reaction

2. and elimination addition reaction

3.   and cine substitution reaction

4.      and cine substitution reaction

Compound A, ${\mathrm{C}}_8{\mathrm{H}}_{10}\mathrm{O}$ is found to react with NaOI (produced by reacting Y with NaOH) and yield a yellow precipitate with a characteristic smell. A and Y are respectively?

1.
2.
3.
4.