Which of the following compounds will give the most stable carbonium ion during dehydration?

Assertion $(A)$: Tertiary alcohols produce turbidity immediately with Lucas reagent.
Reason $(R)$: Lucas reagent is a $1:1$ mixture of conc. $HNO_3$ and anhydrous $ZnCl_2$.
The correct option among the following is:

In which of the following $S_N1$ reactions will a racemic mixture form as the major product?

An alcohol with molecular formula $C_5H_{12}O$ does not change the colour of acidic dichromate solution. Identify that alcohol from the following-

An organic liquid $A$ containing $C$,$H$,and $O$ has a pleasant odour with a boiling point of $78\ ^\circ C$. On boiling $A$ with conc. $H_2SO_4$,a colourless gas is produced which decolourises bromine water and alkaline $KMnO_4$. One mole of this gas also reacts with one mole of $H_2$. The organic liquid $A$ is:

Which of the following reactions is incorrect?