Which product is formed when ethyl alcohol is heated with concentrated $H_2SO_4$?

Given below are two statements :
Statement $I$ :
In Lucas test,primary,secondary and tertiary alcohols are distinguished on the basis of their reactivity with conc. $HCl + ZnCl_{2}$,known as Lucas Reagent.
Statement $II$ :
Primary alcohols are most reactive and immediately produce turbidity at room temperature on reaction with Lucas Reagent.
In the light of the above statements,choose the most appropriate answer from the options given below :

Iodoform can be prepared from all,except

Which of the following gives the iodoform test?

In the given reaction: $CH_3-CH(OH)-C(OH)(CH_3)_2 \xrightarrow{HIO_4} (a) + (b)$. $(a)$ and $(b)$ respectively are:

$A$ solution of optically active $1$-phenylethanol racemizes in acidified aqueous medium. It is due to