Name the straight chain alkane having chemical formula C H , which is used as a research chemical and in making 9 20 biodegradable detergents.

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- Use the general formula for a straight-chain alkane: $C_nH_{2n+2}$. 
- Given formula is $C_9H_{20}$ (interpreting the printed "C H" and "9 20" as subscripts).
- Substitute hydrogen count: $2n+2=20\Rightarrow 2n=18\Rightarrow n=9$. 
- The straight-chain alkane with $n=9$ carbons is nonane. 
- Check options: (1) Nonane corresponds to $C_9H_{20}$, so option (a) is correct.

FINAL_ANSWER: a

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