Question

Structure of Diamond & graphit and free electron in it with respect to diagram ?

Answer 1

diamond has a complicated structure with each carbon atom attached to the other four leaving no free valency / electron .
graphite has a structure of sheets of carbon atom one upon the other which may even sometimes pass other each other due to weak forces b/w them . the carbon atom attaches itself to other 3 atoms leaving behind 1 free valency which is also the reason why it conducts electricity

Answer 2

Diamond is a three dimentional giant molecule of carbon in which C - atoms ( sp3 - hybridised) are arranged tetrahedrally by utilising their sp3 hybrid orbitals.

The C- C bond distance is 154 pm as shown in figure. Each carbon atom seems to lie at the centre of a regular tetrahedron and is linked to four surrounding C - atoms lying at the corners of the tetrahedron through strong covalent bonds.