On heating,which of the following releases $CO_2$ most easily?

Phenol can be converted into salicylic acid by heating with

What is the final product $(B)$ of this sequence?

An open vessel at $300 \ K$ is heated until $2/5$ of the air in it has been expelled. Assuming the volume of the vessel remains constant,find the temperature to which the vessel has been heated in $K$.

How many meiotic divisions are required to produce $100$ grains of wheat?

The bond length of $HCl$ molecule is $1.275 \ \mathring{A}$ and its dipole moment is $1.03 \ D$. The ionic character of the molecule (in percent) (charge of the electron $= 4.8 \times 10^{-10} \ esu$) is