alleryHow many structural isomers are possible for the molecular formula C4H10?
AThree
BOne
CFour
DTwo
Answer & Solution
Correct answer: D. Two
1. The four carbon atoms can be arranged as a straight chain.
2. They can also be arranged as a branched chain.
3. Filling hydrogens to satisfy tetravalency gives two distinct structures, both C4H10.
4. Rule out A: three isomers appear only at C5H12 (pentane), not at butane.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 9 "Carbon Compounds", p.125_
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