The sequence of three steps involved in the following conversion is
The sequence of three steps involved in the following conversion is
Show Hint
- (i) Friedel-Crafts alkylation; (ii) Reduction; (iii) Friedel-Crafts acylation
- (i) Friedel-Crafts acylation; (ii) Friedel-Crafts alkylation; (iii) Reduction
- (i) Friedel-Crafts acylation; (ii) Reduction; (iii) Friedel-Crafts alkylation
- (i) Friedel-Crafts alkylation; (ii) Friedel-Crafts acylation; (iii) Reduction
The Correct Option is B
Solution and Explanation
Step 1: Understanding the reaction sequence.
In this reaction, the first step involves a Friedel-Crafts acylation to form the acylated product. The second step is Friedel-Crafts alkylation, and the final step is reduction, which reduces the carbonyl group to form the desired product.
Step 2: Analyzing the options.
(A) (i) Friedel-Crafts alkylation; (ii) Reduction; (iii) Friedel-Crafts acylation: Incorrect — This sequence is not correct as it involves the wrong order of reactions.
(B) (i) Friedel-Crafts acylation; (ii) Friedel-Crafts alkylation; (iii) Reduction: Correct — This is the correct order for the reactions.
(C) (i) Friedel-Crafts acylation; (ii) Reduction; (iii) Friedel-Crafts alkylation: Incorrect — This sequence is not correct and does not represent the proper order of reactions.
(D) (i) Friedel-Crafts alkylation; (ii) Friedel-Crafts acylation; (iii) Reduction: Incorrect — This sequence is not correct and does not represent the proper order of reactions.
Step 3: Conclusion.
The correct answer is (B) as it correctly represents the sequence of reactions.
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 IIT JAM CY exam
- Which of the following has tetrahedral coordination?
- IIT JAM CY - 2026
- Coordination chemistry
- Given $C_p = a + bT$
$a = 19.5$, $b = 0.042$, $n = 1$ mole
Temperature changes from $27^\circ C$ to $327^\circ C$.
Find $\Delta H$.
- IIT JAM CY - 2026
- Thermodynamics
- T-shape geometry is shown by
- IIT JAM CY - 2026
- VSEPR theory and shape of molecules
- Compare the M–C bond length in the following complexes:
$Na_2[Mn(CO)_4]$, $Na[Mn(CO)_5]$, $Na[Mn(CO)_6]$.
- IIT JAM CY - 2026
- Organometallic Compounds
- For the reaction: \[ N_2O_3(g) \rightarrow NO(g) + NO_2(g) \] If the degree of dissociation is $\alpha = 0.2$, find $\Delta n_g$ and total number of moles at equilibrium (starting with 1 mole).
- IIT JAM CY - 2026
- Law Of Chemical Equilibrium And Equilibrium Constant