The term(s), that does not have a unit among the following, is/are:

(a) Electronegativity

(b) Electron gain enthalpy

(c) Ionization enthalpy

(d) Metallic character

Choose the correct option:

1. (a), (d)

2. (b), (c)

3. (c), (d)

4. (b), (d)

The incorrect order of electronegativity is :

The electronegativity of the following elements increases in the order:

1. C, N, Si, P

2. N, Si, C, P

3. Si, P, C, N

4. P, Si, N, C