$RMgBr$ on reaction with an excess of oxygen followed by hydrolysis gives:

The reaction,water gas $(CO + H_2) + H_2$ at $673 \ K$ and $300 \ \text{atm}$ in the presence of the catalyst $Cr_2O_3/ZnO$ is used for the manufacture of:

Ethanol can be prepared more easily by which reaction?
$(i) \ CH_3CH_2Br + H_2O \longrightarrow CH_3CH_2OH + HBr$
$(ii) \ CH_3CH_2Br + Ag_2O \text{ (moist)} \longrightarrow CH_3CH_2OH + AgBr$

What are $X$ and $Y$ in the following reactions?
$CH_2O \xrightarrow[(ii) H_3O^+]{(i) X} CH_3(CH_2)_2CH_2OH$
$Y \xrightarrow[(ii) H_3O^+]{(i) C_2H_5MgBr} CH_3CH_2C(CH_3)_2OH$

In the given reaction,identify $R$ in $RMgBr$:
$CH_3CH_2CHO \xrightarrow[2. H_3O^+]{1. RMgBr} CH_3CH_2CH(OH)CH_2CH_3$

Which of the following reaction sequences would be the best for the synthesis of $t$-butyl alcohol?