Compounds A and C in the following reaction are __________.
CH3CHO \(\rm \xrightarrow[(ii)H_2O]{(i)CH_3MgBr}(A) \xrightarrow{H_2SO_4,\\\\\\\Delta}(B) \xrightarrow{Hydroboration \ Oxidation}(C)\)
1
identical
2
positional isomers
3
functional isomers
4
optical isomers