Mark the name of the reaction associated with the following conversion
1. Stephen reaction
2. Gattermann-Koch reaction
3. Etard reaction
4. Rosenmund reaction
1. Stephen reaction
2. Gattermann-Koch reaction
3. Etard reaction
4. Rosenmund reaction
Subtopic: Name Reaction |
90%
Level 1: 80%+
NEET - 2023
Hints
Which one of the following represents all isoelectronic species?
| 1. | \(\mathrm{Na^+ , Cl^-, O^- , NO^+}\) | 2. | \(\mathrm{N_2O, N_2O_4 , NO^+, NO}\) |
| 3. | \(\mathrm{Na^+ , Mg^{2+} , O^- , F^-}\) | 4. | \(\mathrm{Ca^{2+} , Ar, K^+, Cl^-}\) |
Subtopic: Ionization Energy (IE) |
77%
Level 2: 60%+
NEET - 2023
Hints
Match List-I with List-II
Choose the correct answer from the options given below:
| List-I (Element) |
List-II (Most Common oxidation state/s) |
||
| A. | \(\mathrm{Fe}\) | I. | +2, +7 |
| B. | V | II. | +3, +2 |
| C. | \(\mathrm{Mn}\) | III. | +4 |
| D. | \(\mathrm{Ti}\) | IV. | +5 |
| 1. | A-II, B-IV, C-I, D-III | 2. | A-IV, B-II, C-I, D-III |
| 3. | A-II, B-I, C-IV, D-III | 4. | A-I, B-IV, C-II, D-III |
Subtopic: d-Block Elements- Properties & Uses |
81%
Level 1: 80%+
NEET - 2024
Hints
Given below are two statements:
In light of the above statements, choose the correct answer from the options given below:
| Statement I: | The value of wave function, \(\Psi\) depends upon the coordinates of the electron in the atom. |
| Statement II: | The probability of finding an electron at a point within an atom is proportional to the orbital wave function. |
| 1. | Statement I is True but Statement II is False. |
| 2. | Statement I is False but Statement II is True. |
| 3. | Both Statement I and Statement II are True. |
| 4. | Both Statement I and Statement II are False. |
Subtopic: Quantum Numbers & Schrodinger Wave Equation |
Level 3: 35%-60%
NEET - 2023
Hints
Match the reagents in List-I with the corresponding reactions in List-II:
Choose the correct answer from the options given below:
1. A-II, B-III, C-I, D-IV
2. A-IV, B-III, C-I, D-II
3. A-I, B-III, C-IV, D-II
4. A-II, B-I, C-III, D-IV
| List-I (Reagent) |
List-II (Name of the reaction) |
||
| A | \(\mathrm{{H}_2, {Pd}-{Ba}S {O}_4}\) | I | Gattermann-Koch reaction |
| B | \(\mathrm{{(i) \; {CrO}_2 {Cl}_2, {CS}_2\\ (ii) ~{H}_2 {O}/H^+}}\) | II | Reimer-Tiemann reaction |
| C | \(\mathrm{{CO, HCl, Anhyd.~\\ {AlCl}_3 / {CuCl}}}\) | III | Etard reaction |
| D | \(\mathrm{{CHCl}_3, {NaOH}}\) | IV | Rosenmund reduction |
Choose the correct answer from the options given below:
1. A-II, B-III, C-I, D-IV
2. A-IV, B-III, C-I, D-II
3. A-I, B-III, C-IV, D-II
4. A-II, B-I, C-III, D-IV
Subtopic: Aldehydes & Ketones: Preparation & Properties |
92%
Level 1: 80%+
NEET - 2024
Hints
Which of the following pair is correctly matched?
1. Basic oxides - \(\mathrm{In_2O_3 , K_2O , SnO_2}\)
2. Neutral oxides - \(\mathrm{CO, NO_2, N_2O}\)
3. Acidic oxides - \(\mathrm{Mn_2O_7, SO_2, TeO_3}\)
4. Amphoteric oxides -\(\mathrm{BeO , Ga_2O_3 , GeO }\)
1. Basic oxides - \(\mathrm{In_2O_3 , K_2O , SnO_2}\)
2. Neutral oxides - \(\mathrm{CO, NO_2, N_2O}\)
3. Acidic oxides - \(\mathrm{Mn_2O_7, SO_2, TeO_3}\)
4. Amphoteric oxides -\(\mathrm{BeO , Ga_2O_3 , GeO }\)
Subtopic: Nature of Compound |
Level 3: 35%-60%
NEET - 2023
Hints
Match List-I with List-II:
Choose the correct answer from the options given below
| List-I (Mixtures/Sample) |
List-II (Technique used for purification) |
||
| A. | Glycerol from spent lye | (I) | Steam distillation |
| B. | Chloroform + Aniline | (II) | Fractional distillation |
| C. | Fractions of crude oil | (III) | Distillation under reduced pressure |
| D. | Aniline+water | (IV) | Distillation |
Choose the correct answer from the options given below
| Options: | (A) | (B) | (C) | (D) |
| 1. | III | IV | II | I |
| 2. | IV | II | I | III |
| 3. | I | II | III | IV |
| 4. | I | III | II | IV |
Subtopic: Purification of Organic Compounds |
78%
Level 2: 60%+
NEET - 2023
Hints
A reaction among the following can generate isonitriles as a major product.
A. \(R-X + HCN \rightarrow \)
B. \(R-X + AgCN \rightarrow \)
C. \(R-X + KCN \rightarrow \)
D. \(R-X + NaCN \xrightarrow [C_2H_5OH] {H_2O} \)
Choose the most appropriate answer from the options given below:
A. \(R-X + HCN \rightarrow \)
B. \(R-X + AgCN \rightarrow \)
C. \(R-X + KCN \rightarrow \)
D. \(R-X + NaCN \xrightarrow [C_2H_5OH] {H_2O} \)
Choose the most appropriate answer from the options given below:
| 1. | (D) only | 2. | (C) and (D) only |
| 3. | (B) only | 4. | (A) and (B) only |
Subtopic: Chemical Properties |
77%
Level 2: 60%+
NEET - 2023
Hints
Which one of the following statements is incorrect related to Molecular Orbital Theory?
| 1. | The \(\pi^*\) antibonding molecular orbital has a node between the nuclei. |
| 2. | In the formation of a bonding molecular orbital, the two electron waves of the bonding atoms reinforce each other. |
| 3. | Molecular orbitals obtained from \(2P_x\) and \(2P_y\) orbitals are symmetrical around the bond axis. |
| 4. | A \(\pi-\)bonding molecular orbital has larger electron density above and below the internuclear axis. |
Subtopic: M.O.T |
52%
Level 3: 35%-60%
NEET - 2023
Hints
Which combination of the following substances will result in the formation of an acidic buffer when mixed?
| 1. | Weak acid and it's salt with a strong base. |
| 2. | Equal volumes of equimolar solutions of weak acid and weak base. |
| 3. | Strong acid and its salt with a strong base. |
| 4. | Strong acid and its salt with a weak base. (The pKa of acid = pKb of the base) |
Subtopic: Buffer |
78%
Level 2: 60%+
NEET - 2023
Hints
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