MPSC PYQ

Isomerism

Isomerism is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2023, 2025). Below are those real questions with their correct answers and explanations.

Real questions
2
Years tested
2 · 2023–2025
In context
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Real questions that test this

संयुग H-C(CH₃)-C(OH)-OH म्हणजेच C₃(H₂O)₃ हे / The compound H-C(CH₃)-C(OH)-OH i.e. C₃(H₂O)₃ is

a)अल्डोट्रायोज, एक कार्बोधक आहे / Aldotriose, a carbohydrate
b)डायहायड्रॉक्सि ट्रायोज, एक कार्बोधक आहे / Dihydroxy triose, a carbohydrate
c)किटोट्रायोज, एक कार्बोधक आहे / Ketotriose, a carbohydrate
d)एक कार्बोधक नाही / Not a carbohydrate✓ Correct

The given compound H-C(CH₃)-C(OH)-OH does not fit the standard definition of a carbohydrate (polyhydroxy aldehydes or ketones with multiple hydroxyl groups on different carbons).

Carbon compounds are broadly classified into two main categories : 1. Organic compounds : These contain carbon and hydrogen and may also include other elements like oxygen, nitrogen, sulfur etc. They include hydrocarbons (such as methane, ethane, propane), alcohols, acids and polymers (like plastics, rubber). Organic compounds are essential in biological systems, forming the basis of molecules like proteins, carbohydrates, lipids and nucleic acids (DNA and RNA). They are also used widely in industries for example, in the manufacture of fuels, dyes, medicines, pesticides and plastics. 2. Inorganic compounds : These include compounds like Carbon dioxide (CO2), Carbon Monoxide (CO), carbonates (such as calcium carbonate in limestone) and bicarbonates. These compounds are vital in geological and environmental processes, such as the carbon cycle, which maintains the balance of carbon in the eco-system. Carbon compounds exhibit various properties, most organic compounds have low melting and boiling points, are generally flammable and more soluble in organic solvents rather than water. This makes them useful as fuels and industrial solvents. Their diversity and reactivity make them a central part of the field of chemistry, particularly in synthetic and pharmaceutical industries.

खालीलपैकी कोणत्या गुणधर्मामुळे कार्बन अनेक संयुगे तयार करू शकतो ? Which of the following properties makes carbon capable of forming many compounds ?

1)जास्त अणुभार / High atomic mass
2)आयनिक बंध तयार करण्याची क्षमता / Ability to form ionic bonds
3)चतुष्क-संयोजकता आणि कॅटनेशन / Tetravalency and catenation✓ Correct
4)विकिरणशील स्वरूप / Radioactive nature

Carbon forms a massive number of compounds due to its tetravalency (valency of 4) and catenation (the unique ability to form long chains with other carbon atoms).

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