The correct option is A Catenation is the property of self-linking of atoms of an element to form chains and rings.
a) Catenation is the property of self-linking of atoms of an element to form chains and rings.
b) Carbon atoms are tetravalent, i.e. they have a valency of 4.
c) Carbon atoms can form single, double or triple covalent bonds.
d) Carbon atoms cannot gain or lose electrons but share electrons to form covalent bonds.
Hence, a is the correct statement.