Which compound undergoes the iodoform reaction?

Fehling solution is

Which of the following undergoes haloform reaction?
$ (i) \ CH_3CH_2COCH_2Cl $
$ (ii) \ C_6H_5COCH_3 $
$ (iii) \ C_6H_5COCHCl_2 $
$ (iv) \ CH_3CH_2COCCl_3 $

Which of the following will reduce Fehling's solution?

The reaction between an ester and an excess of Grignard reagent $(R'MgX)$ finally results in a:

To obtain $3-$methylbutan$-2-$ol from acetaldehyde,the Grignard's reagent used is