The correct statements for 1,3-butadiene from the following are

Molar addition of $$\text{Br}_2$$ yields only 1,4-dibromo-2-butene as the major product when the reaction is performed for longer time period

Molar addition of $$\text{Br}_2$$ yields only 1,2-dibromo-2-butene for longer time period

$$\text{C}_1 - \text{C}_2$$ and $$\text{C}_3 - \text{C}_4$$ bonds are slightly longer than a $$\text{C} = \text{C}$$ bond

$$\text{C}_2 - \text{C}_3$$ single bond is slightly shorter than a $$\text{C} - \text{C}$$ bond