( ( The reaction ) ( ( involves ( ( the breaking ) ( ( ( ( ( of ( ( two ( C-Br bonds ) ) ( -LRB- ( ( one ( per ( bromomethane molecule ) ) ) -RRB- ) ) ) ) and ) ( of ( ( ( an ( F-F bond ) ) and ) ( ( the making ) ( of ( two ( C-F bonds ) ) ) ) ) ) ) and ) ( of ( a ( Br-Br bond ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN reaction)) (VP (VBZ involves) (NP (NP (DT the) (NN breaking)) (PP (PP (IN of) (NP (NP (CD two) (JJ C-Br) (NNS bonds)) (PRN (-LRB- -LRB-) (NP (NP (CD one)) (PP (IN per) (NP (JJ bromomethane) (NN molecule)))) (-RRB- -RRB-)))) (CC and) (PP (IN of) (NP (NP (DT an) (JJ F-F) (NN bond)) (CC and) (NP (NP (DT the) (NN making)) (PP (IN of) (NP (CD two) (JJ C-F) (NNS bonds)))))) (CC and) (PP (IN of) (NP (DT a) (JJ Br-Br) (NN bond)))))) (. .)))
The reaction involves the breaking of two C-Br bonds (one per bromomethane molecule) and of an F-F bond and the making of two C-F bonds and of a Br-Br bond.
(ROOT (S (NP (JJ Catabolic) (NNS reactions)) (VP (VBP involve) (S (VP (VBG breaking) (NP (NNS bonds))))) (. .)))