Question

Match the compounds in Column-I with the properties/uses/effects given in Column-II. \[ \begin{array}{llll} (a) & \text{Chloroform} & (p) & \text{Soluble in fat} \\[6pt] (b) & \text{DDT} & (q) & \text{Antiseptic} \\[6pt] (c) & \text{Freon} & (r) & \text{Oxidation to phosgene} \\[6pt] (d) & \text{Iodoform} & (s) & \text{Depletion of stratospheric } O_3 \text{ layer} \end{array} \]

• A. \((a)-(q),\ (b)-(s),\ (c)-(p),\ (d)-(r)\)
• B. \((a)-(r),\ (b)-(p),\ (c)-(s),\ (d)-(q)\)
• C. \((a)-(s),\ (b)-(q),\ (c)-(r),\ (d)-(p)\)
• D. \((a)-(r),\ (b)-(p),\ (c)-(q),\ (d)-(s)\)

Hint:

\[ \begin{aligned} \text{Chloroform} &: \text{Oxidation to phosgene} \\ \text{DDT} &: \text{Fat-soluble pesticide} \\ \text{Freon} &: \text{Ozone layer depletion} \\ \text{Iodoform} &: \text{Antiseptic} \end{aligned} \]

Answer 1

The Correct Option is B

Step 1: Plan the matching.
Recall one key property or use of each halogen compound.

Step 2: Chloroform (a).
On standing in air and light, chloroform slowly oxidises into the poisonous gas phosgene. So $(a)$ goes with $(r)$.

Step 3: DDT (b).
DDT is fat-soluble, which is why it builds up in fatty tissue. So $(b)$ goes with $(p)$.

Step 4: Freon (c).
Freons (CFCs) rise up and cause depletion of the stratospheric ozone layer. So $(c)$ goes with $(s)$.

Step 5: Iodoform (d).
Iodoform was used as an antiseptic because of the iodine it releases. So $(d)$ goes with $(q)$.

Step 6: Collect the pairs.
Putting it together: $(a)-(r),\ (b)-(p),\ (c)-(s),\ (d)-(q)$, which is the second option.
\[ \boxed{(a)-(r),\ (b)-(p),\ (c)-(s),\ (d)-(q)} \]