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7. Alcohol, phenol and ethers — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry7. Alcohol, phenol and ethers1 Mark
MCQ
$\begin{array}{*{20}{c}}
  {O\,\,\,\,\,\,\,\,\,\,\,\,\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;} \\ 
  {||\,\,\,\,\,\,\,\,\,\,\,\,\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;} \\ 
  {Ph - C - O - H + C{H_3} - {O^{18}} - H\xrightarrow{{{H^ + }}}(X) + {H_2}O} 
\end{array}$ Identify $X$
  • A
    $\begin{array}{*{20}{c}} {\,\,\,O\,\,\,\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
      {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
      {X = Ph - C - {O^{18}} - C{H_3}{\mkern 1mu} } 
    \end{array}$

    Trans esterification

  • ✓
    $\begin{array}{*{20}{c}}
      {O\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
      {||\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
      {X = Ph - C - {O^{18}} - C{H_3}} 
    \end{array}$

    Esterification reaction

  • C
    $\begin{array}{*{20}{c}}
      {O\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
      {||\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
      {X = Ph - C - {O^{18}} - C{H_3}{\mkern 1mu} } 
    \end{array}$

    Saponification

  • D
    $\begin{array}{*{20}{c}}
      {O{\mkern 1mu} {\mkern 1mu} } \\ 
      {||{\mkern 1mu} {\mkern 1mu} } \\ 
      {X = Ph - C - O - C{H_3}{\mkern 1mu} } 
    \end{array}$

    Hydrolysis

✓

Answer

Correct option: B.
$\begin{array}{*{20}{c}}
  {O\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
  {||\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
  {X = Ph - C - {O^{18}} - C{H_3}} 
\end{array}$

Esterification reaction

b
$\begin{array}{*{20}{c}} {O\,\,\,\,\,\,\,\,\,\;\;\,\,\,\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;} \\ {||\,\,\,\,\,\,\,\,\,\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;} \\ {\mathop {Ph{\text{ }} - {\text{ }}C{\text{ }} - {\text{ }}O}\limits_{(acid)} \; - H + \mathop {C{H_3} - \mathop {{\text{ }}O}\limits^{18} - H}\limits_{(alcohol)} \;\mathop \leftrightarrow \limits^{{H^ \oplus }} } \end{array}$$\mathop {\begin{array}{*{20}{c}} {\,\,\,O\;\;\;\,\;\;\;\;\;\;\;\;} \\ {\,\,\,||\;\;\;\;\;\;\;\;\;\;\;\;} \\ {Ph - C - \mathop {{\text{ }}O}\limits^{18} \; - C{H_3}} \end{array}}\limits_{(ester)} \;$

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