( ( ( ( ( ( One pair ) ( is ( shared ( in ( ( ( a ( single bond ) ) , ) ( ( two pair ) ( in ( a ( double bond ) ) ) ) ) ) ) ) ) , ) and ) ( ( three ( elec ( tron pairs ) ) ) ( are ( shared ( in ( a ( triple bond ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (CD One) (NN pair)) (VP (VBZ is) (VP (VBN shared) (PP (IN in) (NP (NP (DT a) (JJ single) (NN bond)) (, ,) (NP (NP (CD two) (NN pair)) (PP (IN in) (NP (DT a) (JJ double) (NN bond))))))))) (, ,) (CC and) (S (NP (CD three) (JJ elec) (NN tron) (NNS pairs)) (VP (VBP are) (VP (VBN shared) (PP (IN in) (NP (DT a) (JJ triple) (NN bond)))))) (. .)))
One pair is shared in a single bond, two pair in a double bond, and three elec tron pairs are shared in a triple bond.
(ROOT (S (PP (IN In) (NP (DT a) (NN carbon) (JJ triple) (NN bond))) (, ,) (NP (NP (CD three) (NNS pairs)) (PP (IN of) (NP (NNS electrons)))) (VP (VBP are) (VP (VBN shared))) (. .)))