Arrange the following compounds in order of their increasing acid strength:
$I: HO_2C(CH_2)_4CO_2H$
$II: CH_3CH(COOH)_2$
$III: HOOC-COOH$
$IV: HO_2C(CH_2)_3CO_2H$

Which among the following compounds is the most acidic?

The silver salt of a carboxylic acid on reaction with $R-X$ gives:

How many of the following compounds react with $NaHCO_3$ to evolve $CO_2$ gas?
$I$: $3$-Nitrophenol
$II$: $2,4$-Dinitrophenol
$III$: $4$-Hydroxybenzoic acid
$IV$: $4$-Methylbenzoic acid
$V$: $4$-Chlorophenol
$VI$: $2,4$-Dinitrotoluene
$VII$: $4$-Hydroxybenzenesulfonic acid
$VIII$: $4$-Sulfobenzoic acid
$IX$: Squaric acid
$X$: Maleic acid

What product is obtained when acetamide is heated with $P_2O_5$?

Although phenoxide ion has more number of resonating structures than carboxylate ion,carboxylic acid is a stronger acid than phenol. Why?