The number of reagents which convert aldehyde or ketones to alkanes in the following list are :
`NaBH_4 , NH_2 NH_2 KOH, HI, r e d P, H_2 Ni, Zn//Hg, HCl, LiAIH_4 , Pt,` acidified `KMnO_4`, alkaline `KMnO_4`

Explanation

To determine the number of reagents that can convert aldehydes or ketones to alkanes from the given list, we will analyze each reagent based on its chemical behavior.

### Step-by-Step Solution:

1. **Identify the Reagents**: The reagents provided are:
- NaBH4
- NH2NH2 (Hydrazine) + KOH
- HI
...