Give the chemical reaction for the preparation of alkanes by the reduction of carboxylic acid using red phosphorus and hydrogen iodide.

Arrange the following acids in their increasing order of acidic strength.

Acetic acid, Chloroacetic acid, dichloroacetic acid, trichloroacetic acid.

Arrange the following acids in their increasing order of acidic strength

Acetic acid, benzoic acid, p-methoxybenzoic acid, p-nitrobenzoic acid.

Identify $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$

Draw the structure of following compound

3-bromo-4-phenylpentanoic acid