Can Chomsky Normal Form have more than one terminal?
The above given CFG cannot be in Chomsky Normal Form since the production 
B→abcd has multiple terminals on left hand side of the production.
In order to convert the given CFG to Chomsky Normal Form, will need to replace the terminals on lhs of production B→abcd as follows - 
B->abcd
B->FG
F->AE
G->CD
E->b
C->c
D->d.