Identify the major product from the following reaction sequence: $Cyclopentylmethanol \xrightarrow[(iii) H^+, (iv) Br_2, Red P, (v) H_2O]{(i) PCC, (ii) Tollen's reagent, NaOH} ?$

Assertion $(A)$: Carboxylic acids are more acidic than Phenols.
Reason $(R)$: Resonance structures of carboxylate ion are equivalent,while resonance structures of phenoxide ion are not equivalent.

Which among the following substituent groups decreases the acidic strength of aromatic carboxylic acid?

Identify $A, B$ and $C$ in the following reactions:
$CH_3 Cl$ $\xrightarrow{KCN} A$ $\xrightarrow{H_3 O^{\oplus}} B$ $\xrightarrow{C_2 H_5 OH / H^{+}, \Delta} C$

When propanoic acid is treated with aqueous sodium bicarbonate,carbon dioxide is liberated. The carbon of the $CO_2$ comes from :

Arrange the following compounds in order of their acidic strength :-
$(i) \, CF_3SO_3H, \, (ii) \, C_6H_5COOH, \, (iii) \, C_6H_5OH$