In $CH_3CH_2OH \xrightarrow{X} CH_2 = CH_2 + H_2O$ at $350 \ ^oC$; $'X'$ is

When $3, 3-$dimethyl$-2-$butanol is heated with ${H_2SO_4}$,the major product obtained is:

The reaction of allyl alcohol with $MCPBA$ ($meta$-chloroperbenzoic acid) is shown below:
Allyl alcohol $\xrightarrow{MCPBA}$ Product
What is the stereochemistry of the product of the above reaction?

$8.8 \ g$ of monohydric alcohol added to ethyl magnesium iodide in ether liberates $2240 \ cm^3$ of ethane at $STP$. This monohydric alcohol when oxidized using pyridinium chlorochromate $(PCC)$,forms a carbonyl compound that answers the silver mirror test (Tollen's test). The monohydric alcohol is:

The reaction of $2$-cyclohexylethanol with $H^{\oplus}$ and $\Delta$ yields a major product $A$. Identify $A$.

What is the product of the oxidation of ethyl alcohol with $K_2Cr_2O_7$?