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GK QUESTION#3509

What is the chemical formula for butane?

  1. AC₄H₈
  2. BC₂H₁₀
  3. CC₂H₆
  4. DC₄H₁₀Correct answer
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Answer

D. C₄H₁₀

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Explanation

Butane has molecular formula C₄H₁₀. An acyclic saturated alkane follows CₙH₂ₙ₊₂, which gives ten hydrogen atoms when n = 4. The formula alone does not distinguish unbranched butane from its branched constitutional isomer.

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