Methods of preparation of Carboxylic acids

Carboxyllic Acid

Acid and Anhydride || Method OF Preparation From Carboxylic Acid From Acid Halides || Chemical Properties From Hydrolysis OF Amides and Method OF Preparation

Method OF preparation OF carboxylic acid and its derivatives || Chemical properties OF carboxylic acid || HVZ reaction || Schmidt reaction || Borodine hunsdiecker reaction || Reaction with R-li+ MnO || Esterification reaction

Introduction OF Carboxylic acid || Naming OF Carboxylic acids || Isomersm || General Properties OF Carboxylic acids ||Acidity OF Carboxylic acids || General Method OF Prepartion OF Carboxylic acids from Various Compounds

Carboxylic acid (A) is:

There are two step-up methods : (i) Grignard reagent and (ii) nitrile method, for the preparation of carboxylic acids from RX , Which method is suitable for the preparation of step-up carboxylic acid from the following RX ? Why ? Give the name of the acid also. (I) (II) (III) (IV) PhCI (V) (VI) (VII) (VIII) (IX) .