In which of the following compounds, the carbon marked with an asterisk is most electronegative?

1. ${\mathrm{CH}}_3-{\mathrm{CH}}_2-*{\mathrm{CH}}_2-{\mathrm{CH}}_3$

2. ${\mathrm{CH}}_3-*\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_3$

3. ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{C}\equiv *\mathrm{CH}$

4. ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{CH}=*{\mathrm{CH}}_2$

Match the terms mentioned in Column-I with the terms in Column-II.

Given below are two statements: 

Two of the following compounds contain all the carbon atoms in the same hybridisation state.

(a) $\mathrm{H}-\mathrm{C}\equiv \mathrm{C}-\mathrm{C}\equiv \mathrm{C}-\mathrm{H}$

(b) ${\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{C}-{\mathrm{CH}}_3$

(c) ${\mathrm{CH}}_2=\mathrm{C}={\mathrm{CH}}_2$

(d) ${\mathrm{CH}}_2=\mathrm{CH}-\mathrm{CH}={\mathrm{CH}}_2$

Choose the correct option:

1. a, b

2. b, c

3. c, d

4. a, d