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NDA 2020 GAT · General Knowledge · Carbon and Organic Chemistry · medium

An alkyne contains five carbon atoms. The number of hydrogen atoms in one molecule is

Single correct option

An alkyne contains five carbon atoms. The number of hydrogen atoms in one molecule is
  1. A. 10
  2. B. 12
  3. C. 8
  4. D. 6
Show answer and solution

Answer: (C) 8

Alkynes have the general formula CnH(2n-2). For n = 5 the formula is C5H8, so there are 8 hydrogen atoms. The value 10 is for alkenes (CnH2n) and 12 is for alkanes (CnH(2n+2)). Remembering the pattern for the three series avoids this trap.
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Original question written in the NDA 2020 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake