1)

$A\xrightarrow[{dil.H_{2}SO_{4}}]{K_{2}Cr_{2}O_{7}}$ $B\xrightarrow[{H_{2}O}]{CH_{2}Mgl}$

the reactant A is?

A) $CH_{3}CHOHCH_{3}$

B) $CH_{3}COCH_{3}$

C) $C_{2}H_{5}OH$

D) $CH_{3}COOH$

$CH_{3}CHOHCH_{3}\xrightarrow[{dil.H_{2}SO_{4}}]{K_{2}Cr_{2}O_{7}}CH_{3}COCH_{3}$ $CH_{3}COCH_{3}\xrightarrow[{H_{2}O}]{CH_{2}Mgl}$