Which of the following nuclear reactions will generate an isotope?

Which among the following statements is $TRUE$ about isotones?

In the following radioactive transformation given below $R$ $\xrightarrow{\alpha} X$ $\xrightarrow{\beta} Y$ $\xrightarrow{\beta} Z$; the nuclei $R$ and $Z$ are

Which of the following is not correct?

In the given reaction,$_{92}U^{235}$ $\xrightarrow{-\alpha } (A)$ $\xrightarrow{-\beta } (B)$ $\xrightarrow{-\beta } (C)$,the isotopes are:

$_{35}X^{88}$ is an unstable isotope,which decays in two successive steps to produce the stable isotope $_{32}Z^{84}$ as $_{35}X^{88}$ $\xrightarrow{I} Y$ $\xrightarrow{II} _{32}Z^{84}$. The correct statement is (possible emissions are $\alpha, \beta^-$,positron,neutron,and $_1H^1$,and in each step only one particle is involved).