a. A single bond is a result of the axial overlap of bonding orbitals. Hence, it contributes a sigma bond. A multiple bond (double or triple bond) is always formed as a result of the sidewise overlap of orbitals. A \(pi-bond\) is always present in it. A triple bond is a combination of two \(pi-bonds\) and one \(sigma \;bond\).
Structure of \(C_2H_2\) can be represented as:
Hence, there are three sigma and two \(pi-bonds\) in \(C_2H_2\).
The structure of \(C_2H_4\) can be represented as:
Hence, there are five sigma bonds and one \(pi-bond\) in \(C_2H_4\).
Match List-I with List-II and select the correct option:
The bond angles \( b_1, b_2, b_3 \) in the above structure are respectively in \( ^\circ \):
Give reasons for the following.
(i) King Tut’s body has been subjected to repeated scrutiny.
(ii) Howard Carter’s investigation was resented.
(iii) Carter had to chisel away the solidified resins to raise the king’s remains.
(iv) Tut’s body was buried along with gilded treasures.
(v) The boy king changed his name from Tutankhaten to Tutankhamun.
Find the mean deviation about the median for the data
xi | 15 | 21 | 27 | 30 | 35 |
fi | 3 | 5 | 6 | 7 | 8 |
Such a group of atoms is called a molecule. Obviously, there must be some force that holds these constituent atoms together in the molecules. The attractive force which holds various constituents (atoms, ions, etc.) together in different chemical species is called a chemical bond.
There are 4 types of chemical bonds which are formed by atoms or molecules to yield compounds.