નીચેનાને તેમના $pK_a$ મૂલ્યોના વધતા ક્રમમાં ગોઠવો

$(x)\begin{array}{*{20}{c}}
{O\,\,\,}\\
{||\,\,\,}\\
{C{H_3} - S - O - H}\\
{||\,\,\,\,}\\
{O\,\,\,\,}
\end{array}$

$\begin{array}{*{20}{c}}
{\,\,\,\,\,O}\\
{\,\,\,\,\,\,||}\\
{(y)\,\,\,C{H_3} - C - O - H}
\end{array}$

$(z)\,\, CH_3 -OH$

Q: નીચેનાને તેમના $pK_a$ મૂલ્યોના વધતા ક્રમમાં ગોઠવો $(x)\begin{array}{*{20}{c}} {O\,\,\,}\\ {||\,\,\,}\\ {C{H_3} - S - O - H}\\ {||\,\,\,\,}\\ {O\,\,\,\,} \end{array}$ $\begin{array}{*{20}{c}} {\,\,\,\,\,O}\\ {\,\,\,\,\,\,||}\\ {(y)\,\,\,C{H_3} - C - O - H} \end{array}$ $(z)\,\, CH_3 -OH$

b Stability of resonance hybrid $\propto$ no. of equivalent $R.S.$ So stability order is $\mathop {\begin{array}{*{20}{c}} O \\ {||} \\ {Me - S - {O^\Theta }} \\ {||} \\ O \end{array}}\limits_{3 - eq.\,R.S.} $ $>$ $\mathop {\begin{array}{*{20}{c}} O \\ {||} \\ {Me - C - {O^\Theta }} \end{array}}\limits_{2 - eq.\,R.S.} $ $>$ $Me - {O^\Theta }$ So Acidic strength order is $x>y>z$ so $\mathrm{pK}_{\mathrm{a}}$ is $z>y>x$

Question

નીચેનાને તેમના $pK_a$ મૂલ્યોના વધતા ક્રમમાં ગોઠવો

$(x)\begin{array}{*{20}{c}}
{O\,\,\,}\\
{||\,\,\,}\\
{C{H_3} - S - O - H}\\
{||\,\,\,\,}\\
{O\,\,\,\,}
\end{array}$

$\begin{array}{*{20}{c}}
{\,\,\,\,\,O}\\
{\,\,\,\,\,\,||}\\
{(y)\,\,\,C{H_3} - C - O - H}
\end{array}$

$(z)\,\, CH_3 -OH$

A$y < x < z$
B$x < y < z$
C$y < z < x$
D$x < z < y$

Medium

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Solution

b
Stability of resonance hybrid $\propto$ no. of equivalent $R.S.$ So stability order is

$\mathop {\begin{array}{*{20}{c}}
O \\
{||} \\
{Me - S - {O^\Theta }} \\
{||} \\
O
\end{array}}\limits_{3 - eq.\,R.S.} $ $>$ $\mathop {\begin{array}{*{20}{c}}
O \\
{||} \\
{Me - C - {O^\Theta }}
\end{array}}\limits_{2 - eq.\,R.S.} $ $>$ $Me - {O^\Theta }$

So Acidic strength order is $x>y>z$ so $\mathrm{pK}_{\mathrm{a}}$ is $z>y>x$

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