MCQ
Among given species identify the isostructural pairs
- A$[NF_3$ and $BF_3 ]$
- B$[BF^-_4$ and $NH^+_4]$
- C$[BCl_3$ and $BrCl_3 ]$
- D$[NH_3$ and $NO^-_3]$
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$(I)$ When $X$ dimerises bond angle decreases
$(II)$ When $X$ dimerises bond angle increases
$(III)$ In $X-Y$ molecule $C-C$ bond length is less than that in $Y-Y$ molecule
$(IV)$ Bond angle in $X$ is greater than that in $Y$
(Use $R =8.31\, J\, K ^{-1}\, mol ^{-1} ; \log 2=0.3010$. In $10=$ $2.3, \log 3=0.477$ )