**Conductance is an extensive property**
Conductance is the measure of a material's ability to conduct an electric current. It is defined as the reciprocal of resistance, and it depends on the size and shape of the conductor. Extensive properties are those that depend on the amount or size of a sample. In the case of conductance, it is directly proportional to the cross-sectional area of the conductor and inversely proportional to its length. Therefore, conductance is an extensive property.

**Equivalent conductivity is an intensive property**
Equivalent conductivity is a measure of the ability of a solution to conduct electricity. It is defined as the conductance of a solution containing one equivalent of the electrolyte per unit volume. Intensive properties are those that do not depend on the size or amount of a sample. In the case of equivalent conductivity, it is independent of the concentration of the electrolyte and only depends on the nature of the electrolyte itself. Therefore, equivalent conductivity is an intensive property.

**Specific conductance is not an extensive property**
Specific conductance, also known as conductivity, is the conductance of a solution divided by the cross-sectional area and multiplied by the length of the solution. It is a measure of the ability of a solution to conduct electricity and is often used to compare the conductivities of different solutions. However, specific conductance is not an extensive property because it is obtained by dividing the conductance by the size of the sample, making it independent of the sample size. Instead, specific conductance is an intensive property.

**Molar conductivity is not an extensive property**
Molar conductivity is the conductivity of a solution divided by the concentration of the electrolyte. It is a measure of the ability of a solution to conduct electricity per mole of the electrolyte. Like specific conductance, molar conductivity is not an extensive property because it is obtained by dividing the conductance by the concentration, making it independent of the sample size. Instead, molar conductivity is an intensive property.

In summary, conductance is an extensive property because it depends on the size and shape of the conductor. Equivalent conductivity is an intensive property because it is independent of the concentration of the electrolyte. Specific conductance and molar conductivity are not extensive properties as they are obtained by dividing the conductance by the size or concentration of the sample, respectively.