The Tischenko reaction yields an ester in the presence of which catalyst?

Aldehydes that do not undergo aldol condensation are:
$1$. $CH_3CH_2CHO$ (propanal)
$2$. $Cl_3CCHO$ (trichloroethanal)
$3$. $HCHO$ (methanal)
$4$. $CH_3CHO$ (ethanal)
$5$. $C_6H_5CHO$ (benzaldehyde)

Which among the following has the highest boiling point?

The major product obtained in the following reaction is:

The above reduction can be best carried out by

Identify the alcohol obtained when an aldehyde other than formaldehyde $(HCHO)$ is treated with Grignard's reagent $(RMgX)$ followed by hydrolysis.