Statement-1: Carbon bas unique ability to form p$\mathrm{\pi }$-p$\mathrm{\pi }$ multiple bonds with itself and with other atoms of small size and high electronegativity. 

Statement-2: Heavier elements of group 14th do not form p$\mathrm{\pi }$-d$\mathrm{\pi }$ bonds because their atomic orbitals are too large and diffused to have effective side ways overlapping.