Consider the following reaction,
ethanol\(\xrightarrow{PB_3}\) X \(\xrightarrow{alc\ KOH}\) Y \(\rm\xrightarrow[(ii)\ H_2O\ heat]{(i)\ H_2SO_4\ room\ temperature}\) Z;
product Z is
1
CH2 = CH2
2
CH3CH2 - O - CH2 - CH3
3
CH3 - CH2 - O - SO3H
4
CH3CH2OH
5
Not Attempted