Which of the following is called the Lucas reagent?

In order to make alcohol undrinkable,pyridine and methanol are added to it. The resulting alcohol is called:

How can $CH_3OH$ be distinguished from $C_2H_5OH$?

$A$ compound $A$ on oxidation gives acetaldehyde,and further oxidation gives an acid. After the first oxidation,the product reacts with ammoniacal $AgNO_3$ to produce a silver mirror. Compound $A$ is likely to be:

Which of the following reagents would distinguish $cis$-cyclopenta-$1,2$-diol from the $trans$-isomer?

When the vapours of tertiary butyl alcohol are passed through heated copper at $573 \ K$,the product formed is