Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q123 (IAS/1994) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Organic chemistry basics Answer Verified

Which one of the following is in the correct sequential order in which these appeared under simulated primitive earth condition ?

Result
Your answer: —  Â·  Correct: A
Explanation

The Miller–Urey context begins with a reducing early atmosphere containing methane among primary gases released during degassing of the young Earth [1]. Under electric discharge or UV, methane with NH3/H2 produces simple organics and gaseous intermediates such as hydrogen cyanide (HCN) formed from the initial gases [3]. HCN and aldehydes then participate in pathways that generate nitriles (including amino‑nitrile intermediates of the Strecker/cyanohydrin chemistry), which subsequently hydrolyse or are converted into amino acids; analytical re‑examinations of Miller‑type experiments support this intermediacy sequence [3]. Thus the correct chronological order is methane → hydrogen cyanide → nitriles → amino acids (Option 1).

Sources

  1. [1] FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.) > Chapter 2: The Origin and Evolution of the Earth > Evolution of Atmosphere and Hydrosphere > p. 15
  2. [2] https://www.pnas.org/doi/10.1073/pnas.1402894111
  3. [3] https://pages.uoregon.edu/jschombe/glossary/miller_urey_experiment.html
How others answered
Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
50%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

NDA-I · 2025 · Q87 Relevance score: -1.01

Which of the following is the correct ascending order of the given minerals in terms of their presence in the Earth's crust ? 1. Amphibolite 2. Mica 3. Pyroxene Select the answer using the code given below :

NDA-II · 2009 · Q37 Relevance score: -1.77

Which one of the following is the correct order in which the gases from the atmosphere disappear as one moves away from the surface of the earth?

NDA-II · 2012 · Q83 Relevance score: -2.27

Which one among the following is the correct order of strenght of acids?

NDA-II · 2008 · Q48 Relevance score: -2.34

Which one of the following is the correct order in which the gases H2, Ne, O2, and N2 are evolved on fractional distillation of liquid air?

IAS · 2005 · Q123 Relevance score: -2.41

Which one of the following is the correct sequence of the given Continents in the decreasing order of their percentage of earth’s land?