
Choose the correct answer from options given below:
- AA-(III), (B)-(IV), (C)-(I), (D)-(II)
- BA-(IV), (B)-(II), (C)-(I), (D)-(III)
- CA-(IV), (B)-(II), (C)-(III), (D)-(I)
- DA-(III), (B)-(IV), (C)-(II), (D)-(I)

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$A\,\xrightarrow{{{k_1}}}B$ ${k_1}\, = \,1.26\, \times \,{10^{ - 4}}\,{S^{ - 1}}$
$A\,\xrightarrow{{{k_2}}}C$ ${k_2}\, = \,3.8\, \times \,{10^{ - 5}}\,{S^{ - 1}}$
The correct statement for the ionic radius of $\mathrm{N}^{3-}$ from the following is :
$(A)$ $(a)$ $n=3,1=1, m_{l}=1, m_{s}=+\frac{1}{2}$
$\quad (b)$ $n =3,1=2, m _{l}=1, m _{s}=+\frac{1}{2}$
$(B)$ $(a)$ $n =3,1=2, m _{l}=-2, m _{s}=-\frac{1}{2}$
$\quad (b)$ $n =3,1=2, m _{l}=-1, m _{s}=-\frac{1}{2}$
$(C)$ $(a)$ $n=4,1=2, m_{l}=2, m_{s}=+\frac{1}{2}$
$\quad (b)$ $n =3,1=2, m _{l}=2, m _{s}=+\frac{1}{2}$
The pairs of electron present in degenerate orbitals is/are...... .