What are the products of reduction for but-2-enal using Na/NH3 and H2/Raney Ni?

This is a Birch reduction condition. For $\alpha, \beta$-unsaturated aldehydes, $\text{Na}/\text{NH}_3$ selectively reduces the carbon-carbon double bond ($\text{C}=\text{C}$) while leaving the aldehyde ($\text{CHO}$) group intact.

Raney Nickel is a powerful, non-selective hydrogenation catalyst. It will reduce both carbon-carbon double bonds ($\text{C}=\text{C}$) and aldehyde ($\text{CHO}$) groups. The aldehyde will be reduced to a primary alcohol.

Sodium borohydride is a mild and selective reducing agent. It reduces aldehydes and ketones to alcohols but does not reduce carbon-carbon double bonds ($\text{C}=\text{C}$).