$RCH=O + H_2 \xrightarrow{\text{catalyst}} RCH_2OH$. Which catalyst is used for this reaction?

What is the product of the following reaction?

$CH_3CH=CHCHO$ is oxidized to $CH_3CH=CHCOOH$ using

In the following compounds,the ones that give positive iodoform test are:
$(I)$ $CH_3CH_2COCH_2CH_3$
$(II)$ $CH_3CH(OH)CH_3$
$(III)$ $1$-indanone
$(IV)$ $CH_3CH_2COCH_3$
$(V)$ $PhCOPh$
$(VI)$ $PhCOCH_3$

Identify the major product $(P)$ in the given reaction of propanal with dilute $NaOH$ followed by heating.

Which one of the following reactions does not represent the correct combination of substrate and product under the given conditions?