alleryA hydrocarbon contains 4 carbon atoms and belongs to the alkyne family. How many hydrogen atoms does its molecule contain?
A10
B8
C6
D4
Answer & Solution
Correct answer: C. 6
1. Alkynes follow the general formula CₙH₂ₙ₋₂.
2. Here n = 4, so the number of hydrogen atoms is 2(4) − 2.
3. That equals 8 − 2 = 6.
4. So the molecule is C₄H₆ with 6 hydrogen atoms; 8 and 10 would suit alkene and alkane respectively.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 11 "Carbon and its Compounds", p.164_
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