Which of the Following Does NOT React with the -SH

Question

Which of the following doesNOTreact with the -SH group on cysteine?
A)N-ethylmaleimide
B)benzaldehyde
C)acrylonitrile
D)iodoacetate

Accepted Answer

The Answer is B

Which of the following does NOT react with the -SH group on cysteine?