Write the method of preparation of carboxylic acid from acyl halides and anhydride compounds.

(N/A) Carboxylic acid from acid chloride compounds:
$(i)$ Acid chlorides when hydrolysed with water give carboxylic acids.
$RCOCl + H_{2}O \longrightarrow RCOOH + HCl$
$(ii)$ Acyl chlorides are more readily hydrolysed with aqueous base to give carboxylate ions,which on acidification provide corresponding carboxylic acids.
$RCOCl$ $\xrightarrow{OH^{-}, H_{2}O} RCOO^{-}$ $\xrightarrow{H_{3}O^{+}} RCOOH$
$(b)$ Carboxylic acid from acid anhydrides:
Anhydrides are hydrolysed to corresponding acid$(s)$ with water.
$(i)$ $(CH_{3}CO)_{2}O + H_{2}O \longrightarrow 2CH_{3}COOH$ (Acetic anhydride $\longrightarrow$ Ethanoic acid)
$(ii)$ $(C_{6}H_{5}CO)_{2}O + H_{2}O \longrightarrow 2C_{6}H_{5}COOH$ (Benzoic anhydride $\longrightarrow$ Benzoic acid)
$(iii)$ $C_{6}H_{5}CO-O-COCH_{3} + H_{2}O \longrightarrow C_{6}H_{5}COOH + CH_{3}COOH$ (Benzoic ethanoic anhydride $\longrightarrow$ Benzoic acid + Acetic acid)