What is the nature of the bond between B and O in `(C_(2)H_(5))_(2)OBH_(3)`

What is the nature of C to C bond in C_2H_4 ?

Draw diagram showing the formation of a double bond and a triple bond between carbon atoms in C_(2)H_(4) and C_(2)H_(2) molecules.

Draw diagrams showing the formation of a double bond and a triple bond between carbon atoms in C_(2)H_(4) and C_(2)H_(2) molecules.

Bond type between O and B in BH_3 larr (OC_2H_5)_2 is:

What is the mass of percent of oxygen in the compound UO_(2)(C_(2)H_(3)O_(2))_(2) NH_(4)C_(2)O_(2).6H_(2)O ? {:(,"Formula Weight g" ,), (,UO_(2)(C_(2)H_(3)O_(2)).6H_(2)O = 573,):}