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Indian Navy Pilot Named Reactions — practice questions

Explore 4 free Named Reactions questions in Indian Navy Pilot Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Named Reactions questions and exercises with answers

Showing questions 1–4 of 4.

The **Finkelstein reaction** uses which solvent for the conversion $RCl \to RI$?Read the answer and worked solution →Among $1$-butanol, $2$-butanol and $tert$-butanol, the order of reactivity in the Lucas test isRead the answer and worked solution →In the **Etard reaction**, toluene is oxidised to benzaldehyde byRead the answer and worked solution →Identify the correct conversion: $CH_3CN \xrightarrow{?} CH_3CHO$ (one step).Read the answer and worked solution →

Worked practice questions

The **Finkelstein reaction** uses which solvent for the conversion $RCl \to RI$?

  1. Benzene
  2. Acetone
  3. Water
  4. Ethanol
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Correct answer: B. Acetone

$RCl + NaI \xrightarrow{acetone} RI + NaCl\downarrow$. Acetone dissolves NaI but precipitates NaCl, driving the equilibrium to the iodide by Le Chatelier's principle.

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Among $1$-butanol, $2$-butanol and $tert$-butanol, the order of reactivity in the Lucas test is

  1. 3° > 2° > 1°
  2. All equal
  3. 1° > 2° > 3°
  4. 2° > 3° > 1°
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Correct answer: A. 3° > 2° > 1°

Lucas test forms a carbocation intermediate. Stability is 3° > 2° > 1° → reactivity follows the same order. $tert$-butanol is cloudy immediately 1-butanol won't react at room temperature.

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In the **Etard reaction**, toluene is oxidised to benzaldehyde by

  1. $O_3$
  2. $CrO_2Cl_2$ in $CS_2$
  3. $K_2Cr_2O_7/H_2SO_4$
  4. $KMnO_4$
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Correct answer: B. $CrO_2Cl_2$ in $CS_2$

$C_6H_5CH_3 \xrightarrow{CrO_2Cl_2/CS_2} \text{chromyl complex} \xrightarrow{H_2O} C_6H_5CHO$. Chromyl chloride stops at the aldehyde because the intermediate Etard complex protects the $-CHO$ from over-oxidation until workup.

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More Chemistry topics

Alcohols Phenols EthersAlkenesOrganic ChemistryPolymersChemical EquilibriumStates of MatterAtoms and MoleculesClassification of Elements