UPSC Civil Services Main 2025 Chemistry Paper II PDF

Central Government Jobs Other Jobs 2025

  • Year 2025
  • Conducted By UPSC
  • Questions 8
  • Maximum Marks 250
  • Duration Three Hours
  • Languages Hindi & English

Exam Details

Detail Information
Examination UPSC Civil Services (Main) Examination
Year 2025
Conducting Body UPSC
Paper Chemistry Paper - II
Subject Chemistry
Duration Three Hours
Maximum Marks 250
Number of Questions 8
Question Type Mixed

This document contains the UPSC Civil Services (Main) Examination 2025 Chemistry Paper II question paper. The paper is designed to assess candidates' in-depth knowledge of Chemistry. It comprises eight questions divided into two sections, with candidates required to answer five questions in total. Questions 1 and 5 are compulsory, and at least one question must be attempted from each section. The paper carries a maximum of 250 marks and is to be completed within a duration of three hours. This paper is a crucial resource for aspirants preparing for the UPSC Civil Services Main Examination, offering a clear understanding of the exam's scope and difficulty level.

Major Topics Covered

  • Chemistry
  • Organic Chemistry
  • Aromaticity
  • Chemical Reactions
  • Reaction Mechanisms

Why This Paper is Important

  • Useful for UPSC Civil Services (Main) Examination preparation
  • Helps understand the latest exam pattern
  • Useful for practice and self-assessment
  • Covers frequently asked General Studies topics
  • Helpful for analysing question trends

Related Resources

  • UPSC Civil Services Main 2025 Chemistry Paper I
  • UPSC Civil Services Main 2025 General Studies Paper I
  • UPSC Civil Services Main 2025 General Studies Paper II
  • UPSC Civil Services Main 2025 General Studies Paper III
  • UPSC Civil Services Main 2025 General Studies Paper IV
  • UPSC Civil Services Main 2025 Chemistry Paper II Answer Key
  • UPSC Civil Services Main Chemistry Syllabus
  • UPSC Civil Services Main Exam Pattern

Instructions

  • इसमें आठ प्रश्न हैं जो दो खण्डों में विभाजित हैं तथा हिन्दी और अंग्रेजी दोनों में छपे हुए हैं।
  • परीक्षार्थी को कुल पाँच प्रश्नों के उत्तर देने हैं।
  • प्रश्न संख्या 1 और 5 अनिवार्य हैं तथा बाकी प्रश्नों में से प्रत्येक खण्ड से कम-से-कम एक प्रश्न चुनकर तीन प्रश्नों के उत्तर दीजिए।
  • प्रत्येक प्रश्न/भाग के लिए नियत अंक उसके सामने दिए गए हैं।
  • प्रश्नों के उत्तर उसी प्राधिकृत माध्यम में लिखे जाने चाहिए, जिसका उल्लेख आपके प्रवेश-पत्र में किया गया है, और इस माध्यम का स्पष्ट उल्लेख प्रश्न-सह-उत्तर (क्यू० सी० ए०) पुस्तिका के मुखपृष्ठ पर निर्दिष्ट स्थान पर किया जाना चाहिए।
  • प्राधिकृत माध्यम के अतिरिक्त अन्य किसी माध्यम में लिखे गए उत्तर पर कोई अंक नहीं मिलेंगे।
  • जहाँ आवश्यक हो, निर्देशांक आरेखों को प्रश्न का उत्तर देने के लिए दिए गए स्थान में ही बनाना है।
  • जब तक उल्लिखित न हो, संकेत तथा शब्दावली प्रचलित मानक अर्थों में प्रयुक्त हैं।
  • यदि आवश्यक हो, तो उपयुक्त आँकड़ों का चयन कीजिए तथा उनको स्पष्टतया निर्दिष्ट कीजिए।
  • प्रश्नों के प्रयासों की गणना क्रमानुसार की जाएगी।
  • आंशिक रूप से दिए गए प्रश्नों के उत्तर को भी मान्यता दी जाएगी यदि उसे काटा न गया हो।
  • प्रश्न-सह-उत्तर पुस्तिका में खाली छोड़े गए कोई पृष्ठ अथवा पृष्ठ के भाग को पूर्णतः काट दीजिए।

  • There are EIGHT questions divided in two Sections and printed both in HINDI and in ENGLISH.
  • Candidate has to attempt FIVE questions in all.
  • Question Nos. 1 and 5 are compulsory and out of the remaining, THREE are to be attempted choosing at least ONE question from each Section.
  • The number of marks carried by a question/part is indicated against it.
  • Answers must be written in the medium authorized in the Admission Certificate which must be stated clearly on the cover of this Question-cum-Answer (QCA) Booklet in the space provided.
  • No marks will be given for answers written in a medium other than the authorized one.
  • Coordinate diagrams, wherever required, shall be drawn in the space provided for answering the question itself.
  • Unless otherwise mentioned, symbols and notations have their usual standard meanings.
  • Assume suitable data, if considered necessary, and indicate the same clearly.
  • Attempts of questions shall be counted in sequential order.
  • Unless struck off, attempt of a question shall be counted even if attempted partly.
  • Any page or portion of the page left blank in the Question-cum-Answer Booklet must be clearly struck off.

Questions (page 2)

Section A

Q1. ट्रोपोलोन ऐरोमैटिक है, लेकिन फल्वीन नॉन-ऐरोमैटिक है। ऐसा क्यों है? छद्म-ऐरोमैटिकता को उदाहरण देकर समझाइए।
Tropolone is aromatic, but fulvene is non-aromatic. Why?
Explain with example pseudo-aromaticity. निम्नलिखित रासायनिक रूपांतरण में लुप्त अभिकर्मक तथा मध्यवर्तियों की पहचान कीजिए:
Identify the missing reagent and intermediates in the following chemical conversion : निओमेन्थिल क्लोराइड की सोडियम एथॉक्साइड के साथ एथेनॉल में अभिक्रिया करने पर बनने वाले मुख्य उत्पाद की संरचना लिखिए। अपने उत्तर का औचित्य सिद्ध कीजिए:
Write the structure of the major product when neomenthyl chloride is reacted with sodium ethoxide in ethanol. Justify your answer :

(a) (i) ट्रोपोलोन ऐरोमैटिक है, लेकिन फल्वीन नॉन-ऐरोमैटिक है। ऐसा क्यों है?

(b) (ii) छद्म-ऐरोमैटिकता को उदाहरण देकर समझाइए।

(a) CH3
PCI5
0 °C
(-POCl3)
M
1) 3 equiv.
NaNH2
Heat
2) HA
N
NaNH2
C2H5Br
O
P
C=C
H
CH2CH3
H

(a) H3C
CH(CH3)2
OEt
?
Cl
निओमेन्थिल क्लोराइड
H3C
CH(CH3)2
OEt
?
Cl
Neomenthyl chloride

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Frequently asked questions

What is the name of the exam?

The exam is the UPSC Civil Services (Main) Examination.

What is the year of this question paper?

This question paper is from the year 2025.

Who conducts the Civil Services (Main) Examination?

The examination is conducted by the UPSC (Union Public Service Commission).

What is the name of this specific paper?

This is Chemistry Paper - II.

What is the maximum marks for this paper?

The maximum marks for Chemistry Paper - II is 250.

What is the time allowed to complete this paper?

The time allowed is Three Hours.

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