Question
Why does
Zn + HCl reduce aldehydes and ketones to alcohols while
Zn - Hg amalgam + HCl reduce aldehyde and ketones to alkanes
Joshi sir comment

Why does
Zn + HCl reduce aldehydes and ketones to alcohols while
Zn - Hg amalgam + HCl reduce aldehyde and ketones to alkanes