When chloroform is hydrolysed with $KOH$,the final product is:

The decreasing order of acidity of the following benzoic acid derivatives is:

The decreasing order of acidic strength for the following acids is:
$(A)$ $CH_3COOH$
$(B)$ $CH_3CHClCH_2COOH$
$(C)$ $ClCH_2COOH$
$(D)$ $Cl_2CHCOOH$

When salicylic acid is treated with acetic anhydride,we get:

Assertion $: - >C=O$ group is present in both aldehydes and acid derivatives.
Reason $: -$ Aldehydes give nucleophilic addition across $>C=O$ bond but acid derivatives do not exhibit such reactions.

If the rate of the reaction,$R-CO-Z + Nu^- \rightarrow R-CO-Nu + Z^-$ is fastest,then $Z$ is