2. structure of atom — Chemistry STD 11 Science — Question

$(I)\, s-$ orbital of $A$ and $P_x$ -orbital of $B$

$(II)\, s-$ orbital of $A$ and $P_z$ orbital of $B$

$(Ill)\, p_y$ -orbital of $A$ and $p_z$ orbital of $B$

$(IV)\, s-$ orbital of both $(A)$ and $(B)$

$(1)$ $NaN{H_2};\mathop {C{H_3}}\limits^{{\text{a}}\,\,\,\,\,\,\,} C{H_2}Br$:${H_2},{\text{ }}\mathop {{\text{(one mole)}}}\limits^{\text{b}} {\text{ }}Pd{\text{ or }}Ni$

$(2)$ $NaN{H_2};C{H_3}C{H_2}C{H_2}Br$:${H_2}{\text{ (two moles) }}Pd{\text{ or }}Ni$

$(3)$ $NaN{H_2};C{H_3}C{H_2}C{H_2}Br$:${H_2},{\text{ (one mole) }}Pd{\text{ or }}Ni$

$(4)$ $NaN{H_2};C{H_3}C{H_2}C{H_2}Br$:$B{H_3},{H_2}{O_2},O{H^ - }$

To obtain high yields of $CH_3Cl$, the ratio of $CH_4$ to $Cl_2$ must be