Assertion: Carbon has unique ability to form 
multiple bonds with itself and with other atomic of small size and high electronegativety.
Reason: Heavier elements of group 14th do not form 
bonds because their atomic orbital are too large and diffuse to have effective sideways overlapping.
Text Solution
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Atomic size of carbon is smaller and thus is has effective overlapping with itself and with other atom of small size and high electronegative. Few example of multiple bonding are 
and 
heaver element do not form pπ−pπ bonds because their atomic orbitals are too large and diffuse to have effective overlapping.
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