MCQ
Sodium acetate reacts with acetyl chloride to form
  • A
    Acetic acid
  • B
    Acetone
  • Acetic anhydride
  • D
    Sodium formate

Answer

Correct option: C.
Acetic anhydride
c
(c)$\underset{\begin{smallmatrix} 
 \text{Sodium} \\ 
 \text{acetate} 
\end{smallmatrix}}{\mathop{C{{H}_{3}}COONa}}\,\,\,+\underset{\text{Acetyl}\,\,\text{chloride}}{\mathop{C{{H}_{3}}COCl}}\,\to NaCl+\underset{\text{Acetic}\,\,\text{anhydride}}{\mathop{C{{H}_{3}}COOCOC{{H}_{\,3}}}}\,$

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A solution $\mathrm{M}$ is prepared by mixing ethanol and water. The mole fraction of ethanol in the mixture is $0.9$ .

Given: Freezing point depression constant of water $\left(\mathrm{K}_{\mathrm{f}}^{\text {rate }}\right)=1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$

Freezing point depression constant of ethanol $\left(\mathrm{K}_{\mathrm{f}}^{\text {ethunol }}\right)=2.0 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$

Boiling point elevation constant of water $\left(\mathrm{K}_{\mathrm{b}}^{\text {nate }}\right)=0.52 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$

Boiling point elevation constant of ethanol $\left(\mathrm{K}_{\mathrm{b}}^{\text {ethanol }}\right)=1.2 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$

Standard freezing point of water $=273 \mathrm{~K}$

Standard freezing point of ethanol $=155.7 \mathrm{~K}$

Standard boiling point of water $=373 \mathrm{~K}$

Standard boiling point of ethanol $=351.5 \mathrm{~K}$

Vapour pressure of pure water $=32.8 \mathrm{~mm} \mathrm{Hg}$

Vapour pressure of pure ethanol $=40 \mathrm{~mm} \mathrm{Hg}$

Molecular weight of water $=18 \mathrm{~g} \mathrm{~mol}^{-1}$

Molecular weight of ethanol $=46 \mathrm{~g} \mathrm{~mol}^{-1}$

In answering the following questions, consider the solutions to be ideal dilute solutions and solutes to be non-volatile and nondissociative.

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$(C)$ $234.2 \mathrm{~K}$ $(D)$ $150.9 \mathrm{~K}$

$2.$ The vapour pressure of the solution ${M}$ is

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$(C)$ $29.5 \mathrm{~mm} \mathrm{Hg}$ $(D)$ $28.8 \mathrm{~mm} \mathrm{Hg}$

$3.$ Water is added to the solution ${M}$ such that the fraction of water in the solution becomes $0.9$ . The boiling point of this solution is

$(A)$ $380.4 \mathrm{~K}$ $(B)$ $376.2 \mathrm{~K}$

$(C)$ $375.5 \mathrm{~K}$ $(D)$ $354.7 \mathrm{~K}$

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