Question 78 of 83
Q.Which of the following compound has the same percentage of Carbon as in Ethylene (C2H4) ?
(a) Benzene
(b) Propene
(c) Ethane
(d) Ethyne
Puducherry TnboardTamil Nadu HSC First Year (DGE) Board 2025MCQ· 1mImportance★★★★★
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Start your 14-day free trial to unlock the full solution →Ethylene (C2H4) is about 85.7% carbon by mass, and propene (C3H6) has exactly the same percentage because both share the empirical formula CH2.
First find %C in ethylene, C2H4 (molar mass = 2(12) + 4(1) = 28 g/mol):
%C = (24/28) x 100 = 85.7%
Now check each option (using C=12, H=1):
- Benzene, C6H6 (M = 78): %C = (72/78) x 100 = 92.3% — does not match.
- Propene, C3H6 (M = 42): %C = (36/42) x 100 = 85.7% — matches exactly.
- Ethane, C2H6 (M = 30): %C = (24/30) x 100 = 80.0% — does not match.
- Ethyne, C2H2 (M = 26): %C = (24/26) x 100 = 92.3% — does not match. …
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