MCQ practice · SSC Chemistry Board questions · Chapter 11: Mineral Resources: Fossils
Which of these is the formula of bromopropane?
Think it through first, then pick an option.
- a C₃H₇Br
- b C₃H₈Br
- c C₃H₅Br
- d C₃H₄Br
Answer and explanation
Correct answer: a C₃H₇Br
Removing one H from propane C₃H₈ gives propyl C₃H₇ (CₙH₂ₙ₊₁); adding Br gives C₃H₇Br.
Why the other options are wrong
- b C₃H₈Br: This keeps all 8 H of propane and adds Br; Br takes the place of one H, so C₃H₇Br.
- c C₃H₅Br: C₃H₅ is not an alkyl group (CₙH₂ₙ₊₁ gives C₃H₇); so C₃H₇Br.
- d C₃H₄Br: C₃H₄ is propyne's formula, not a group; bromopropane is C₃H₇Br.
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