What is a chromatogram?

What is $R_f$?

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Thin layer chromatography is an adsorption chromatography.
Reason $R$: $A$ thin layer of silica gel is spread over a glass plate of suitable size in thin layer chromatography which acts as an adsorbent.
In the light of the above statements,choose the correct answer from the options given below.

Which of the following organic compounds could not be dried by anhydrous $CaCl_{2}$?

From the figure of column chromatography given below,identify the incorrect statements.
$A.$ Compound '$c$' is more polar than '$a$' and '$b$'
$B.$ Compound '$a$' is least polar
$C.$ Compound '$b$' comes out of the column before '$c$' and after '$a$'
$D.$ Compound '$a$' spends more time in the column
Choose the correct answer from the options given below :-

By mistake,an alcohol (boiling point $97\,^{\circ}C$) was mixed with a hydrocarbon (boiling point $68\,^{\circ}C$). Suggest a suitable method to separate the two compounds. Explain the reason for your choice.