Question

Which of the following is/are correct :-

• A. Carbon-carbon bond length in $CaC _{2}$ will be more than that in $CH _{2} CCH _{2}$
• B. $O - O$ bond length in $KO _{2}$ is more than that in $Na _{2} O _{2}$
• C. $O - O$ bond length in $BaO _{2}$ will be more than that in $KO _{2}$
• D. $N-O $ bond length in $NO$ gaseous molecule is equal to bond length in $NOCl$ gaseous molecule

Answer 1

Answer: (C)

(i) In $CaC _{2} \rightarrow Ca ^{+2} C _{2}^{-2}\left[- C \equiv C ^{-}\right]$(Triple bond)
In $CH _{2} CCH _{2} \rightarrow H _{2} C = C = CH _{2}$ (double bond)
(ii) In $KO _{2} \rightarrow \,\,O _{2}^{-} \,\,$ bond order $=1.5$
In $Na_2 O _{2} \rightarrow O _{2}^{-2} \,\,\,$ bond order $=1$
(iii) In $O_2\left[ PtF _{ s }\right] \rightarrow O ^{+2} \,\,\,$ bond order $=1$
In $KO _{2} \rightarrow O _{2}^{-} \,\,\,$ bond order $=1.5$
(iv) In $NO \rightarrow$ bond order $=2.5$
In $NOCl \rightarrow NO ^{+} \,\,\,$ bond order $=2$