JEE MAIN - Chemistry (2013 (Offline) - No. 19)
In which of the following pairs of molecules/ions, both the species are not likely to exist?
$$H_2^+$$ , $$He_2^{2-}$$
$$H_2^-$$ , $$He_2^{2-}$$
$$H_2^{2+}$$ , $$He_2$$
$$H_2^-$$ , $$He_2^{2+}$$
Paliwanag
$$H_2^{2+}$$ , $$He_2$$
Both have zero bond order. Thus, they do not exist.
Both have zero bond order. Thus, they do not exist.