Oxidation of ethanol by chromic acid forms

When ethanol is treated with sulphuric acid at $413 \ K$,the reaction involved in it is:

The reaction of $4-(\text{aminomethyl})\text{cyclohexylmethanol}$ with acetic anhydride $(Ac_2O)$ proceeds in two steps to form $P$ and $Q$. Identify $P$ and $Q$ respectively.

Most acidic alcohol out of the following compounds is

What is formed when glycerol reacts with $HI$?

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