Question

Which one of the following alcohols is most reactive for $S_{N}1$ reaction?

$\left(a\right)C{H}_3-\underset{C{H}_3}{\underset{|}{\stackrel{OH}{\stackrel{|}{C}}}}-C{H}_3\left(b\right)C_6{H}_5-\underset{C{H}_3}{\underset{|}{\stackrel{OH}{\stackrel{|}{C}}}}-C_6{H}_5$
$\left(c\right)C{H}_3-\underset{C{H}_3}{\underset{|}{\stackrel{OH}{\stackrel{|}{C}}}}-C{H}_3\left(d\right)C{H}_3-\stackrel{OH}{\stackrel{|}{C}}-C{H}_3$

• A. $a$
• B. $b$
• C. $c$
• D. $d$

Answer 1

The correct option is B $b$

$C_6{H}_5-\underset{C{H}_3}{\underset{|}{\stackrel{OH}{\stackrel{|}{C}}}}-C_6{H}_5$

The carbocation of this alcohol is most stable.