List-I ( Ions ) | List-II ( No. of unpaired electrons ) | ||
| A | Zn$^{2+}$ | (I) | 0 |
| B | Cu$^{2+}$ | (II) | 4 |
| C | Ni$^{2+}$ | (III) | 1 |
| D | Fe$^{2+}$ | (IV) | 2 |
An infinitely long straight wire carrying current $I$ is bent in a planar shape as shown in the diagram. The radius of the circular part is $r$. The magnetic field at the centre $O$ of the circular loop is :


From the following, how many compounds contain at least one secondary alcohol? 
Electron Configuration is referred to as the distribution of electrons in an atom's orbitals. An electron in an atom is defined by a set of four quantum numbers (n), the most important of which defines the main energy level known as a shell. The filling of electrons into different subshells, also known as orbitals (s, p, d, f) in an atom. The position of an element in the periodic table is determined by the quantum numbers of the last orbital filled.