Which of the following compounds on oxidation gives ethyl methyl ketone?

In the reaction,$C_2H_5OC_2H_5 + CO \xrightarrow[150^{\circ}C, 500 \text{ atm pressure}]{BF_3} X$. What is $X$?

The resolving limit of a healthy human eye is about:

Which is the best method to obtain virus-free plants through tissue culture?

Consider the following two statements,$A$ and $B$ and identify the correct answer given below:
$A$. Nuclear density is same for all nuclei.
$B$. Radius of the nucleus $R$ and its mass number $A$ are related as $\sqrt{A} \propto R^{1 / 6}$.

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?