In the reaction sequence:
$CH_3-CH(OH)-COOH$ $\xrightarrow{\Delta } [Y]$
$[Y]$ will be:

Which of the following has the highest $pK_a$ value?

Propanoic acid undergoes the $HVZ$ reaction to give $2-$chloropropanoic acid. The product obtained is:

Which of the following is the strongest acid?

The compounds that produce $CO_2$ with aqueous $NaHCO_3$ solution are:
$A$. Benzoic acid
$B$. Phenol
$C$. $2,4,6$-Trinitrophenol (Picric acid)
$D$. Cyclohexanecarboxylic acid
$E$. $4$-Methoxyphenol
Choose the correct answer from the options given below:

The decreasing order of acid strengths for the following compounds is: $Ph-OH$ $(A)$,$Ph-CH_2-OH$ $(B)$,$Ph-CO_2H$ $(C)$,$Ph-CH_2-NH_3^+$ $(D)$