The number of correct reaction(s) among the following is ________.
Correct Answer: 1
Solution and Explanation
Analyze Each Reaction:
Reaction (A): The reaction conditions suggest Friedel-Crafts acylation using anhydrous \( \text{AlCl}_3 \) and a carboxylic acid chloride. This reaction should proceed correctly, forming the expected acylated aromatic product.
Reaction (B): In this reaction, \( \text{Pd/BaSO}_4 \) (Rosenmund reduction conditions) is used to reduce an acyl chloride to an aldehyde. This reaction is incorrect.
Reaction (C): This reaction involves a carboxylic acid reacting with CO and HCl under anhydrous conditions with \( \text{AlCl}_3 \) or CuCl. However, this is not a standard reaction for carboxylic acid conversion to an acyl chloride under these conditions, so this reaction is incorrect.
Reaction (D): The conditions involve the reaction of a benzene derivative with \( \text{CONH}_2 \) and HCl. However, these reagents are not compatible with producing an expected product under the given conditions, making this reaction incorrect.
Conclusion:
Only Reaction (A) is correct among the given reactions. Therefore, the number of correct reactions is 1, corresponding to Option (1).
Top Questions on Reaction Mechanisms & Synthesis
- The reaction represented by \( A \rightarrow B \) follows first-order kinetics. At a given temperature, 20% of the reaction is completed in 223 s. The time taken to complete 50% of the reaction at the same temperature is _________ s (rounded off to the nearest integer).
- GATE MT - 2025
- Mineral Processing and Extractive Metallurgy
- Reaction Mechanisms & Synthesis
- Consider the following reactions and their standard Gibbs free energies (in J): \[ {Fe(s)} + \frac{1}{2} {O}_2(g) \rightleftharpoons {FeO(s)} \quad \Delta G^\circ = -264900 + 65T \] \[ 2 {H}_2(g) + {O}_2(g) \rightleftharpoons 2 {H}_2{O(g)} \quad \Delta G^\circ = -492900 + 109T \] Assuming Fe and FeO to be pure and no solubility of gases in the solids, the value of \( \frac{p_{H_2O}}{p_{H_2}} \) required to reduce solid FeO to solid Fe at 1000 K is _________ (rounded off to two decimal places). Given: Ideal gas constant \( R = 8.314 \, {J mol}^{-1} {K}^{-1} \).
- GATE MT - 2025
- Mineral Processing and Extractive Metallurgy
- Reaction Mechanisms & Synthesis
- Molten steel at 1900 K having dissolved hydrogen needs to be vacuum degassed. The equilibrium partial pressure of hydrogen to be maintained to achieve 1 ppm (mass basis) of dissolved hydrogen is ......... Torr (rounded off to two decimal places). Given: For the hydrogen dissolution reaction in molten steel \( \left( \frac{1}{2} {H}_2(g) = [{H}] \right) \), the equilibrium constant (expressed in terms of ppm of dissolved H) is: \[ \log_{10} K_{eq} = \frac{1900}{T} + 2.4 \] 1 atm = 760 Torr.
- GATE MT - 2025
- Mineral Processing and Extractive Metallurgy
- Reaction Mechanisms & Synthesis
- Consider the gas phase reaction: \[ CO + \frac{1}{2} O_2 \rightleftharpoons CO_2 \] At equilibrium for a particular temperature, the partial pressures of \( CO \), \( O_2 \), and \( CO_2 \) are found to be \( 10^{-6} \, {atm} \), \( 10^{-6} \, {atm} \), and \( 16 \, {atm} \), respectively. The equilibrium constant for the reaction is ......... \( \times 10^{10} \) (rounded off to one decimal place).
- GATE MT - 2025
- Mineral Processing and Extractive Metallurgy
- Reaction Mechanisms & Synthesis
- In the Claisen-Schmidt reaction to prepare dibenzalacetone from 5.3 g benzaldehyde, a total of 3.51 g of product was obtained. The percentage yield in this reaction was _____.
- JEE Main - 2025
- Chemistry
- Reaction Mechanisms & Synthesis
Questions Asked in JEE Main exam
Which of the following best represents the temperature versus heat supplied graph for water, in the range of \(-20^\circ\text{C}\) to \(120^\circ\text{C}\)?
- JEE Main - 2026
- Thermodynamics
- When a part of a straight capillary tube is placed vertically in a liquid, the liquid rises upto certain height \( h \). If the inner radius of the capillary tube, density of the liquid and surface tension of the liquid decrease by \(1%\) each, then the height of the liquid in the tube will change by ________ %.
- JEE Main - 2026
- thermal properties of matter
- A gas of certain mass filled in a closed cylinder at a pressure of $3.23\,\text{kPa}$ has temperature $50^\circ$C. The gas is now heated to double its temperature. The modified pressure is ___ Pa.
- JEE Main - 2026
- Thermodynamics
- Let the circle \(x^2+y^2=4\) intersect the \(x\)-axis at points \(A(a,0)\) and \(B(b,0)\). Let \(P(2\cos\alpha,2\sin\alpha)\), \(0<\alpha<\frac{\pi}{2}\), and \(Q(2\cos\beta,2\sin\beta)\) be two points on the circle such that \((\alpha-\beta)=\frac{\pi}{2}\). Then the point of intersection of lines \(AQ\) and \(BP\) lies on:
- JEE Main - 2026
- Circles
- The moment of inertia of a square loop made of four uniform solid cylinders, each having radius R and length L (\(R \le L\)) about an axis passing through the mid points of opposite sides, is (Take the mass of the entire loop as M) :
- JEE Main - 2026
- Kinematics