Question

Which of the following elements is not present in salvarsan?

• A. \(\text{As}\)
• B. \(\text{N}\)
• C. \(\text{O}\)
• D. \(\text{P}\)

Hint:

Salvarsan is an organoarsenic compound of C, H, N, O and As.

Answer 1

The Correct Option is D

Step 1: Recall the structure
Arsenic-arsenic linked rings with amino and hydroxy groups.

Step 2: Check each element
As, N and O are present. P is not.

Step 3: Conclude
Arsenic, not phosphorus, is the group 15 element in the drug.

Final Answer:
Phosphorus is the missing element. \[ \boxed{\text{(D) }\text{P}} \]