The compound that is most difficult to protonate is:

1.  

2.  

3.  

4.  

Ethylene oxide when treated with Grignard reagent yields :

1. Secondary alcohol

2. Tertiary alcohol

3. Cyclopropyl alcohol

4. Primary alcohol

The general molecular formula, that represents the homologous serious of alkanols is:
1. \(C_{n} H_{2 n} O_{2}\)
2. \(C_{n} H_{2 n} O\)
3. \(C_{n} H_{2 n + 1} O\)
4. \(C_{n} H_{2 n + 2} O\)

Consider the following reaction, $\mathrm{Ethanol}\stackrel{{\mathrm{PBr}}_3}{\to }\mathrm{X}\stackrel{\mathrm{alc}. \mathrm{KOH}}{\to }\mathrm{Y}\underset{\left(\mathrm{ii}\right){\mathrm{H}}_2\mathrm{O}, \mathrm{heat}}{\overset{\left(\mathrm{i}\right){\mathrm{H}}_2{\mathrm{SO}}_4, \mathrm{room} \mathrm{temperature}}{\to }}\mathrm{Z};$ 
the product Z, is

1. $C{H}_2=C{H}_2$

2. $C{H}_{3}C{H}_2-O-C{H}_2-C{H}_3$

3. $C{H}_3-C{H}_2-O-S{O}_{3}H$

4. $C{H}_{3}C{H}_{2}OH$

Consider the following reaction, 
$\mathrm{Phenol}\stackrel{\mathrm{Zn} \mathrm{dust}}{\to }\mathrm{X}\underset{\mathrm{Anhy}. {\mathrm{AlCl}}_3}{\overset{{\mathrm{CH}}_3\mathrm{Cl}}{\to }}\mathrm{Y}\stackrel{\mathrm{Alkaline} {\mathrm{KMnO}}_4}{\to }\mathrm{Z}$ 
the product, Z, is

1. Toluene

2. Benzaldehyde

3. Benzoic acid

4. Benzene

In the following reactions, 
 
The major products A. and C. are respectively

1.  

2.  

3.  

4.