In which radioactive disintegration does a neutron dissociate into a proton and an electron?

Which of the following nuclear reactions is possible?

Neutrino is a particle which $\qquad$

After the decay of a single $\beta$ particle, the parent and daughter nuclei are

Two radioactive substances $A$ and $B$ of mass numbers $200$ and $212$ respectively, show spontaneous $\alpha$-decay with the same $Q$ value of $1 \text{ MeV}$. The ratio of energies of $\alpha$-rays produced by $A$ and $B$ is . . . . . . .

The $A_{92}U^{238}$ nucleus decays to a $Pb^{214}_{82}$ nucleus. The number of $\alpha$ and $\beta^{-}$ particles emitted are: