Primary alcohols on dehydration give

What product is formed when ethyl alcohol is oxidized with $K_2Cr_2O_7$?

Which of the following intermediates is formed when an alcohol reacts with concentrated $H_2SO_4$?

$A$ toxic compound $A$ when reacted with $NaCN$ in aqueous acidic medium yields an edible cooking component and food preservative $B$. $B$ is converted to $C$ by diborane and can be used as an additive to petrol to reduce emission. $C$ upon reaction with oleum at $140^{\circ} C$ yields an inhalable anesthetic $D$. Identify $A, B, C$ and $D$,respectively.

Statement-$1$ : Secondary $\&$ Tertiary alcohols can be distinguished by Lucas reagent.
Statement-$2$ : Secondary $\&$ Tertiary alcohols can be distinguished by dichromate test.

What is the $IUPAC$ name of the organic compound formed in the following chemical reaction?
Acetone $\xrightarrow[(ii) H_2O, H^{+}]{(i) C_2H_5MgBr, \text{dry Ether}}$ Product