Methyl cyanide `underset("conc. "HCl)overset(2[H],SnCl_(2))to P overset(H_(2)O //H^(+))to Q`
`Qoverset(HCN)to R overset(H^(+), H_(2)O)to S`
The number of chiral carbon(s) present in the final product 'S' is -------

Answer

1

Explanation

`underset("Methyl cyanide")(CH_(3)-C-=N) +2[H] underset(Conc. HCl)overset(SnCl_(2))to CH_(3)-underset((P))underset("Hydrochloride")underset("Acetaldimine")(CH=NHCl) underset(H^(+))overset(H_(2)O)to underset((Q))underset("Acetaldehyde")(CH_(3)CHO)+NH_(4)Cl`
`underset((Q))underset("Acetaldehyde")(CH_(3)-overset(O)overset(||)C-H)+underset("cyanide")underset("Hydrogen")(HCN)to underset((R ))underset("cyanohydrin")underset("Acetaldehyde")(CH_(3)-underset(CN)underset(|)overset(OH)overset(|)C-H) underset("hydrolysis")overset("acid")to underset(("optically active"))underset("Lactic acid (S)")(CH_(3)-underset(" COOH")underset(|)overset(OH)overset(|)(C^(**))-H)`