## Answers

1 **formalin** from aldehyde family disinfect **crosslinking functional group.**

a) formlin, carcinogen action - wrong

- formalin is a human carcinogen that does not disinfect by carcinogen action.

b) glutaraldehyde, denaturing protein and inactive nucleic acid - wrong

- glutaraldehyde used as effective disinfection by crosslinking functional groups.

c) copper, -NH group of proteins - wrong.

- copper is not from the aldehyde family.

d) formalin, crosslinking functional group - correct

- As formalin is formaldehyde dissolved in water it disinfects by making crosslinks with amino groups of bacterial protein and killing them.

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