Q30 · CSIR NET Chemistry, June 2018
Paper: CSIR NET June 2018 · Subject: Inorganic Chemistry · Chapter: Chemical Bonding · Topic: Hydrogen Bonding Weak Interactions · Marks: 2 · Difficulty: Medium
Consider the nature of solvents in column I and the corresponding max for l in various solvents given in column II. (for I, vapor axis 520 nm). Match column I with column II
| Column - I | Column - II | ||
|---|---|---|---|
| (a) | Non-donor | (i) | 520 |
| (b) | Weak donor | (ii) | 500 |
| (c) | Strong donor | (iii) | 450 |
| (d) | $\pi$ electron donor | (iv) | 360 |
(a)(a)-(i); (b)-(ii); (c)-(iii); (d)-(iv)
(b)(a)-(iii); (b)-(iv); (c)-(ii); (d)-(i)
(c)(a)-(i); (b)-(iii); (c)-(iv); (d)-(ii)
(d)(a)-(iv); (b)-(iii); (c)-(ii); (d)-(i)
Answer
Answer: C ✓ checked by 4AB · confidence low
Explanation
I₂ absorbs at 520 nm in non-donor solvents. Donor complexation blue-shifts the band: π-donors (benzene) to about 500 nm, weak n-donors to about 450 nm, and strong n-donors (amines) to about 360 nm. That gives a-i, b-iii, c-iv, d-ii (c).
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