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Indian Navy 10+2 B.Tech Cadet Named Reactions — practice questions

Explore 2 free Named Reactions questions in Indian Navy 10+2 B.Tech Cadet 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 1–2 of 2.

The **Hell–Volhard–Zelinsky (HVZ) reaction** converts a carboxylic acid (with $\alpha$-H) to an $\alpha$-halo acid usingRead the answer and worked solution →**Diazotisation** of a primary aromatic amine uses $NaNO_2 + HCl$ atRead the answer and worked solution →

Worked practice questions

The **Hell–Volhard–Zelinsky (HVZ) reaction** converts a carboxylic acid (with $\alpha$-H) to an $\alpha$-halo acid using

  1. $NaOBr$
  2. $Br_2$ with red phosphorus
  3. $Cl_2$ with $hv$
  4. $KMnO_4$
Show answer and solution

Correct answer: B. $Br_2$ with red phosphorus

$RCH_2COOH + Br_2 \xrightarrow{red\,P} RCHBrCOOH + HBr$. Red P generates $PBr_3$ which converts the acid to acyl bromide the $\alpha$-position then enolises and brominates.

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**Diazotisation** of a primary aromatic amine uses $NaNO_2 + HCl$ at

  1. $-78\,°C$
  2. $0$–$5\,°C$
  3. $80$–$100\,°C$
  4. $25$–$30\,°C$
Show answer and solution

Correct answer: B. $0$–$5\,°C$

$ArNH_2 + NaNO_2 + 2\,HCl \xrightarrow{0\text{-}5\,°C} ArN_2^+Cl^- + NaCl + 2\,H_2O$. Low temperature keeps the diazonium salt from decomposing to $ArOH + N_2\uparrow$.

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