SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If an alkane has 20 carbon atoms, how many hydrogen atoms will it have?
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20
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22
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40
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42
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Explanation:
Detailed explanation-1: -Because there is a single ring, the unsaturation number is 1, and the number of hydrogen atoms must be two fewer than the number contained in an alkane. For 20 (n) carbon atoms of an alkane, there are 42 (2n + 2) hydrogen atoms. For the monocyclic compound, there are 40 hydrogen atoms. The molecular formula is C20H40.
Detailed explanation-2: -(b)Molecular formula of an alkane having 42 carbon atoms is C 42 H 86 .
Detailed explanation-3: -There are 12 ends or bends, so this molecule has 12 C atoms. Alkanes have a general formula of CnH2n+2, meaning there are 2(12) + 2 = 26 H atoms.
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