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Identify the major product obtained in the following reaction:
$$+\ 2\,[\text{Ag(NH}_3)_2]^+ \xrightarrow{\text{OH}^-,\,\Delta}\ \text{major product}$$
Tollens selectively oxidises –CHO to –COO⁻ (silver mirror); does not touch ketones.
Match List-I (Oxoacids of Sulphur) with List-II (Bonds):
| List-I | List-II |
|---|---|
| A. Peroxodisulphuric acid (H₂S₂O₈) | I. 2 S–OH, 4 S=O, 1 S–O–S |
| B. Sulphuric acid (H₂SO₄) | II. 2 S–OH, 1 S=O |
| C. Pyrosulphuric acid (H₂S₂O₇) | III. 2 S–OH, 4 S=O, 1 S–O–O–S |
| D. Sulphurous acid (H₂SO₃) | IV. 2 S–OH, 2 S=O |
Peroxodisulphuric has peroxo (O–O); pyrosulphuric has –O– (no peroxo); sulphuric has 2 S=O; sulphurous has 1 S=O.
On balancing the given redox reaction
$$a\,\text{Cr}_2\text{O}_7^{2-} + b\,\text{SO}_3^{2-}(\text{aq}) + c\,\text{H}^+(\text{aq}) \rightarrow 2a\,\text{Cr}^{3+}(\text{aq}) + b\,\text{SO}_4^{2-}(\text{aq}) + \tfrac{c}{2}\,\text{H}_2\text{O}(\ell)$$
the coefficients a, b and c are found to be, respectively:
Cr₂O₇²⁻ gains 6e (a=1); SO₃²⁻ → SO₄²⁻ loses 2e (b=3); charge balance with H⁺: c = 8.
Pumice stone is an example of:
Gas dispersed in solid → solid foam (pumice).
Which complex compound is most stable?
$[\text{Co(NH}_3)_6]^{3+}$ is exceptionally inert and stable with six identical strong-field ligands.
Consider the following reaction:
$$\text{C}_6\text{H}_5\text{CH}_2\text{-O-C}_6\text{H}_5 \xrightarrow[\Delta]{\text{HI}} A + B$$
Identify products A and B.
In ArOR + HI, the alkyl side is cleaved → RI; the aryl side becomes ArOH.
Identify the final product [D] obtained in the following sequence:
$$\text{CH}_3\text{CHO} \xrightarrow[(ii)\,\text{H}_3\text{O}^+]{(i)\,\text{LiAlH}_4} [A] \xrightarrow[\Delta]{\text{H}_2\text{SO}_4} [B] \xrightarrow{\text{HBr}} [C] \xrightarrow{\text{C}_6\text{H}_5\text{Br},\ \text{Na/dry ether}} [D]$$
CH₃CHO → CH₃CH₂OH (A) → CH₂=CH₂ (B) → CH₃CH₂Br (C) → Wurtz with PhBr/Na → PhCH₂CH₃ = ethylbenzene.
Given below are two statements:
Statement I: The nutrient deficient water bodies lead to eutrophication.
Statement II: Eutrophication leads to decrease in the level of oxygen in the water bodies.
Choose the correct answer:
Eutrophication is caused by NUTRIENT-RICH (not deficient) water; it does deplete dissolved O₂.
Which amongst the following will be most readily dehydrated under acidic conditions?
Dehydration is easier when the carbocation formed is not destabilised by a nearby EWG. In (D) the NO₂ is far from the OH carbon, so the 2° cation is least destabilised.
What fraction of one edge-centred octahedral void lies in one unit cell of fcc?
An edge is shared by 4 unit cells → each edge-centred void contributes 1/4.
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