Compound with molecular formula ${\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O}$ can show:

Choose the correct statement regarding the formation of carbocations A and B given :-

Given below are two statements:
Statement-I: Retardation factor $\left({\mathrm{R}}_{\mathrm{f}}\right)$ can be measured in meter/centimetre.

Statement-II: ${\mathrm{R}}_{\mathrm{f}}$ value of a compound remains constant in all solvents.

Choose the most appropriate answer from the options given below:

Match List-I with List-II 

The correct match is :

In Duma's method of estimation of nitrogen, $0.1840 \mathrm{g}$ of an organic compound gave $30 \mathrm{mL}$ of nitrogen collected at $287 \mathrm{K}$ and $758 \mathrm{mm}$ of $\mathrm{Hg}$ pressure. The percentage composition of nitrogen in the compound is ______. (Round off to the Nearest Integer).

[Given : Aqueous tension at $287 \mathrm{K}=14 \mathrm{mm}$ of $\mathrm{Hg}$]

Assertion A : Enol form of acetone $\left[{\mathrm{CH}}_3{\mathrm{COCH}}_3\right]$ exists in $<0.1\%$ quantity. However, the enol form of acetyl acetone $\left[{\mathrm{CH}}_3{\mathrm{COCH}}_2{\mathrm{OCCH}}_3\right]$ exists in approximately $15\%$quantity.

Reason R : enol form of acetyl acetone is stabilized by intramolecular hydrogen bonding, which is not possible in enol form of acetone.

Choose the correct statement: