Consider following compounds and find out the value of x+y . If x is the number of 
most acidic compounds and Y is the number of least acidic compounds.
             
$\underset{\left(1\right)}{C{H}_2=CH-C{H}_2-OH}$ 

$\underset{\left(2\right)}{Ph-C{H}_2-OH}$

$\underset{\left(3\right)}{Ph-C\equiv C-H}$

$\underset{\left(4\right)}{H-C\equiv C-COOH}$

 

 

 

$\underset{\left(7\right)}{Ph-COOH}$

$\underset{\left(8\right)}{H-COOH}$