NCERT Solution for Class Tenth Science Chapter 4
Carbon and its Compounds
CBSE NCERT Book Session-2022-2023
Exercises Questions
Page No-21
Questions No-4
Explain the nature of the covalent bond using the bond formation in CH3Cl.
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NCERT Solution for Class Tenth Science Chapter 4
Carbon and its Compounds
CBSE NCERT Book Session-2022-2023
Exercises Questions
Page No-21
Questions No-4
Carbon can neither lose four of its electrons nor gain four electrons as both the processes
require extra amount of energy and would make the system unstable. Therefore, it
completes its octet by sharing its four electrons with other carbon atoms or with atoms of
other elements. The bonds that are formed by sharing electrons are known as covalent
bonds. In covalent bonding, both the atoms share the valence electrons, i.e., the shared
electrons belong to the valence shells of both the atoms.
Here, carbon requires 4 electrons to complete its octet, while each hydrogen atom requires
one electron to complete its duplet. Also, chlorine requires an electron to complete the
octet. Therefore, all of these share the electrons and as a result, carbon forms 3 bonds
with hydrogen and one with chlorine.
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Covalent bond is formed by sharing of electrons so that the combining atoms complete their outermost shell.
In CH3Cl : C = 6, H = 1 and Cl = 17 And their electronic configuration is C – 2,4, H – 1 and Cl – 2, 8, 7
Three hydrogen atoms complete their shells by sharing three electrons (one electron each) of carbon atom.
Chlorine completes its outer shell by sharing its one out of seven electrons with one electron of carbon atom.
Thus carbon atom shares all its four electrons with three hydrogen atoms and one of chlorine atom and completes its outermost shell and single covalent bonds are formed in CH3Cl.
The covalent bond is a type of chemical bond that occurs when two atoms share electrons to achieve a stable electron configuration. Covalent bonds are commonly found in molecules composed of nonmetals. Let’s use the formation of methyl chloride (CH3Cl) as an example to explain the nature of a covalent bond.
In methyl chloride (CH3Cl), carbon (C) and hydrogen (H) are both nonmetals, while chlorine (Cl) is also a nonmetal. When these atoms come together to form a molecule, they participate in covalent bonding. Here’s how it works:
1. Carbon (C) has four valence electrons in its outermost electron shell, and it needs a total of eight electrons to achieve a stable, noble gas electron configuration (similar to that of neon). Hydrogen (H) has one valence electron and needs two electrons to achieve a stable electron configuration, similar to helium.
2. Chlorine (Cl) has seven valence electrons and needs only one more electron to achieve a stable electron configuration, similar to that of argon.
Now, let’s consider how these atoms come together to form CH3Cl:
. Carbon (C) shares one of its four valence electrons with each of the three hydrogen atoms (H). This sharing results in each hydrogen atom having a total of two electrons in its outermost shell, achieving a stable electron configuration similar to helium (H2).
. The remaining carbon electron, along with the three electrons from the three hydrogen atoms, forms three covalent bonds (electron pairs) between carbon and hydrogen. These covalent bonds are shared pairs of electrons, allowing both carbon and hydrogen to achieve stable electron configurations.
Carbon (C) also shares one of its four valence electrons with the chlorine atom (Cl). This sharing results in chlorine having a total of eight electrons in its outermost shell, achieving a stable electron configuration similar to argon.
. The covalent bond between carbon (C) and chlorine (Cl) consists of a shared pair of electrons.
In this way, the covalent bond in CH3Cl is formed by the sharing of electrons between the atoms, which allows them to complete their outermost electron shells and attain a more stable electron configuration. The covalent bonds between carbon and hydrogen, as well as between carbon and chlorine, are the result of this electron sharing, which holds the atoms together in the molecule.