Question

Diamond and graphite are good conductors of electricity.
(A) True
(B) False

Answer 1

Electricity is a free flow of electrons. If the structure of the compound has free electrons, the, it is said to be a good conductor of electricity. Both diamond and graphite are allotropes of carbon. Allotropes are compounds which are chemically the same but vary in their physical properties. Different structures give rise to different properties.

Complete step by step solution:
Let us discuss carbon first to understand. Carbon belongs to the $\text{II}$ period and $\text{XIV}$ group of the periodic table. It is a metalloid and the highest self-linking property. Being the first member of its group, carbon is the smallest size and does not have d-orbitals. It also forms strong bonds with metals, nonmetals and metalloids. Diamond and graphite are large molecules of carbon which do not have a specific formula. Their size completely depends on the extent of their physical structures. The structural difference in diamond and graphite leads to different physical as well as chemical properties.
Let us look at the differences between diamond and graphite via a table which gives us the complete idea of their conductivity:

DIAMOND	GRAPHITE
1. The hybridisation of carbon here is $\text{s}{{\text{p}}^{3}}$. Therefore it has a tetrahedral structure and it has a crystal structure. 2. All four valencies of carbon atoms are satisfied. 3. It behaves as an insulator because there are no free electrons present in its $3-\text{D}$ structure for the conduction of electricity.	1. The hybridisation of carbon is $\text{s}{{\text{p}}^{2}}$. The structure is trigonal planar. The planes in graphite slip over one another without forming any strong bonding between them.2. Only three valencies of carbon are filled.3. It can easily conduct electricity because it has one free electron per $\text{s}{{\text{p}}^{2}}$ hybridised carbon.

Graphite is a good conductor of electricity but Diamond does not conduct electricity.

So, the answer to this question is False, which is option (B).

Note: Diamond and graphite have different physical properties but the chemical properties are similar because both are composed of the same element (carbon).
Carbon has many allotropes and forms, the electrical conductivity of each of them is Buckminster fullerenes is a good electric conductor and Graphene is a good electric conductor.