A) \[{{[NiC{{l}_{4}}]}^{2-}}\]
B) \[{{[PtC{{l}_{4}}]}^{2-}}\]
C) \[\alpha -\]
D) \[C{{H}_{3}}-C\equiv CH+2HBr\xrightarrow[{}]{{}}\]
Correct Answer: D
Solution :
Since, each term is equal to the sum of next two terms. \[\therefore \] \[a{{r}^{n-1}}=a{{r}^{n}}+a{{r}^{n+1}}\] \[\Rightarrow \]\[1=r+{{r}^{2}}\Rightarrow {{r}^{2}}+r-1=0\] \[\Rightarrow \]\[r=\frac{\sqrt{5}-1}{2}\] \[\left( \because r\ne \frac{-\sqrt{5}-1}{2} \right)\]
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