MCQ
Which among the given haloalkanes develop colour when exposed to light?
- A$\text{R−Br}$ and $\text{R−Cl}$
- B$R−I$ and $R−F$
- C$\text{R−Cl}$ and $\text{R−Br}$
- ✓$\text{R−Br}$ and $R−I$
✓
Answer
Correct option: D.
$\text{R−Br}$ and $R−I$
As we progress down the periodic table from fluorine to iodine, molecular size increases. As a result, we also see an increase in bond length.
As the bond length increases, upon irradiation of light, after absorption the compound emit light in visible region. Hence$, \text{R-Br}$ and $R-I$ bond exhibit color when exposed to light.
As the bond length increases, upon irradiation of light, after absorption the compound emit light in visible region. Hence$, \text{R-Br}$ and $R-I$ bond exhibit color when exposed to light.
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