alleryUsing the alkyne general formula CnH2n-2, what is the molecular formula of the third member (n = 4)?
AC4H8
BC4H4
CC4H10
DC4H6
Answer & Solution
Correct answer: D. C4H6
1. The alkyne general formula is CnH2n-2.
2. Substitute n = 4 for the third member.
3. Hydrogens = 2(4) - 2 = 8 - 2 = 6.
4. So the formula is C4H6.
5. Rule out A: C4H8 uses 2n (the alkene rule), not 2n-2.
6. Rule out C: C4H10 is the alkane butane, fully saturated.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 9 "Carbon Compounds", p.129_
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