B.Sc Analytical Chemistry Important Questions Units 1–6 PDF Notes 2026 | Spectroscopy, Chromatography & Electrochemistry

Download B.Sc Analytical Chemistry important questions and notes for Units 1 to 6 including UV-Vis spectroscopy, FTIR, Raman spectroscopy, NMR, Mass spectrometry, AAS, electro analytical techniques, GC and HPLC. Exam-oriented Hindi and English questions for 2026 university exams.

Practical Aspects of Chemical Analysis – Important Questions

1. Explain the analysis of real samples and sources of errors in decomposition and dissolution.

हिंदी: वास्तविक नमूनों के विश्लेषण तथा decomposition एवं dissolution में होने वाली त्रुटियों के स्रोतों को समझाइए।

मुख्य बिंदु:

• Choice of analytical method
• Preparation of standard samples
• Moisture removal and drying
• Decomposition and dissolution of sample
• Sources of analytical errors

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2. Explain automation in laboratory and classification of analytical methods.

हिंदी: प्रयोगशाला स्वचालन (Automation in Laboratory) तथा analytical methods के वर्गीकरण को समझाइए।

मुख्य बिंदु:

• Types of analytical methods
• Instrumental methods
• Analog and digital signals
• Automatic instruments
• Importance of laboratory automation
• Good laboratory practices (GLP)

Unit 2 – Electronic & Vibrational-Rotational Spectroscopy

Important Questions

1. Explain the basic principle, instrumentation and applications of UV-Visible Spectroscopy.

हिंदी: UV-Visible Spectroscopy के मूल सिद्धांत, उपकरण व्यवस्था एवं अनुप्रयोगों को समझाइए।

मुख्य बिंदु:

• Basic principle of UV-Vis spectroscopy
• Instrumentation
• Absorption of radiation
• Electronic transitions
• Applications in analysis

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2. Explain Raman Effect and Stokes & Anti-Stokes lines.

हिंदी: Raman Effect तथा Stokes एवं Anti-Stokes रेखाओं को समझाइए।

मुख्य बिंदु:

• Raman scattering
• Vibrational Raman spectra
• Stokes and Anti-Stokes lines
• Intensity difference
• Rule of mutual exclusion

isme se exam ke according imp 2 question find kro aur hindi aur english me type kr do

Important Questions (Exam Oriented)

1. Explain SN1 and SN2 mechanisms with comparison.

हिंदी: SN1 और SN2 अभिक्रिया तंत्र को अंतर सहित समझाइए।

मुख्य बिंदु:

• Mechanism (तंत्र)
• Rate law (वेग नियम)
• Effect of substrate and nucleophile
• Stereochemistry
• Difference between SN1 and SN2

Relevant formula/concept:
$\mathrm{R}\mathrm{a}\mathrm{t}\mathrm{e}\mathrm{o}\mathrm{f}\mathrm{S}\mathrm{N}1=k[RX],\mathrm{R}\mathrm{a}\mathrm{t}\mathrm{e}\mathrm{o}\mathrm{f}\mathrm{S}\mathrm{N}2=k[RX][N{u}^{-}]$Rate of SN1=k[RX],Rate of SN2=k[RX][Nu−]

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2. Explain Aromatic Electrophilic Substitution and orientation effect.

हिंदी: Aromatic Electrophilic Substitution तथा orientation/directive effect को समझाइए।

मुख्य बिंदु:

• Arenium ion mechanism
• Ortho, para and meta directing groups
• Activating and deactivating groups
• Electronic explanation
• Examples: nitration, halogenation

Important reaction concept:
$\mathrm{A}\mathrm{r}-\mathrm{H}+{\mathrm{E}}^{+}\to \mathrm{A}\mathrm{r}-\mathrm{E}+{\mathrm{H}}^{+}$Ar−H+E+→Ar−E+H+

ye 2 aur 3 unit he dono me se 2,2 question find krke likho

Unit 2 – Important Exam Questions

1. Explain Markovnikov and Anti-Markovnikov addition reactions with examples.

हिंदी: मार्कोनिकोव तथा एंटी-मार्कोनिकोव योग अभिक्रियाओं को उदाहरण सहित समझाइए।

मुख्य बिंदु:

• Regioselectivity
• Orientation of addition
• Peroxide effect
• Mechanism with alkene reactions

Important concept:
$\mathrm{C}{\mathrm{H}}_2=\mathrm{C}{\mathrm{H}}_2+\mathrm{H}\mathrm{X}\to \mathrm{C}{\mathrm{H}}_3-\mathrm{C}{\mathrm{H}}_2\mathrm{X}$CH2​=CH2​+HX→CH3​−CH2​X

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2. Explain E1 and E2 elimination mechanisms with differences.

हिंदी: E1 तथा E2 elimination mechanism को अंतर सहित समझाइए।

मुख्य बिंदु:

• Mechanism
• Rate law
• Saytzeff rule
• Hofmann rule
• Effect of substrate and base

Rate expression:
$\mathrm{R}\mathrm{a}\mathrm{t}\mathrm{e}\mathrm{o}\mathrm{f}\mathrm{E}1=k[RX],\mathrm{R}\mathrm{a}\mathrm{t}\mathrm{e}\mathrm{o}\mathrm{f}\mathrm{E}2=k[RX][Base]$Rate of E1=k[RX],Rate of E2=k[RX][Base]

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Unit 3 – Important Exam Questions

1. Explain preparation, properties and applications of Grignard reagent.

हिंदी: ग्रिगनार्ड अभिकर्मक की तैयारी, गुण एवं उपयोगों को समझाइए।

मुख्य बिंदु:

• Preparation in dry ether
• Structure and reactivity
• Reaction with aldehydes/ketones
• Applications in organic synthesis

Important reaction:
$\mathrm{R}\mathrm{M}\mathrm{g}\mathrm{X}+\mathrm{H}\mathrm{C}\mathrm{H}\mathrm{O}\to \mathrm{R}\mathrm{C}{\mathrm{H}}_2\mathrm{O}\mathrm{H}$RMgX+HCHO→RCH2​OH

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2. Explain Beckmann rearrangement or Baeyer–Villiger rearrangement with mechanism.

हिंदी: Beckmann rearrangement अथवा Baeyer–Villiger rearrangement को तंत्र सहित समझाइए।

मुख्य बिंदु:

• Rearrangement mechanism
• Migration of groups
• Formation of amide/lactone or ester
• Applications in synthesis

Important concept:
$\mathrm{R}-\mathrm{C}\mathrm{O}-{\mathrm{R}}^{\mathrm{\prime }}+\mathrm{P}\mathrm{e}\mathrm{r}\mathrm{a}\mathrm{c}\mathrm{i}\mathrm{d}\to \mathrm{E}\mathrm{s}\mathrm{t}\mathrm{e}\mathrm{r}$R−CO−R′+Peracid→Ester

ye 4 unit he isme se 2

Unit 4 – Important Exam Questions

1. Explain oxidation of alcohols to carbonyl compounds with suitable oxidizing agents.

हिंदी: अल्कोहॉल का कार्बोनिल यौगिकों में ऑक्सीकरण उपयुक्त ऑक्सीकारकों सहित समझाइए।

मुख्य बिंदु:

• Oxidation of primary and secondary alcohols
• Chromium and manganese reagents
• Formation of aldehydes and ketones
• Mechanism and applications

Important reaction:
$\mathrm{R}\mathrm{C}{\mathrm{H}}_2\mathrm{O}\mathrm{H}+[\mathrm{O}]\to \mathrm{R}\mathrm{C}\mathrm{H}\mathrm{O}\to \mathrm{R}\mathrm{C}\mathrm{O}\mathrm{O}\mathrm{H}$RCH2​OH+[O]→RCHO→RCOOH

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2. Explain catalytic hydrogenation and reduction by LiAlH4 and NaBH4.

हिंदी: उत्प्रेरक हाइड्रोजनीकरण तथा LiAlH₄ एवं NaBH₄ द्वारा अपचयन को समझाइए।

मुख्य बिंदु:

• Catalytic hydrogenation
• Palladium/Raney Nickel catalyst
• Difference between LiAlH₄ and NaBH₄
• Reduction of aldehydes and ketones
• Mechanism and applications

Important reduction reaction:
$\mathrm{R}\mathrm{C}\mathrm{H}\mathrm{O}+2[\mathrm{H}]\to \mathrm{R}\mathrm{C}{\mathrm{H}}_2\mathrm{O}\mathrm{H}$RCHO+2[H]→RCH2​OH

2

Unit 5 – Important Exam Questions

1. Explain Norrish Type I and Norrish Type II photochemical reactions.

हिंदी: Norrish Type I तथा Norrish Type II प्रकाश-रासायनिक अभिक्रियाओं को समझाइए।

मुख्य बिंदु:

• Photochemical excitation
• Free radical formation
• Cleavage reactions
• Mechanism and examples
• Difference between Type I and Type II

Photochemical concept:
$\mathrm{R}-\mathrm{C}\mathrm{O}-\mathrm{R}\stackrel{\mathrm{h}\nu }{\to }\mathrm{F}\mathrm{r}\mathrm{e}\mathrm{e}\mathrm{R}\mathrm{a}\mathrm{d}\mathrm{i}\mathrm{c}\mathrm{a}\mathrm{l}\mathrm{P}\mathrm{r}\mathrm{o}\mathrm{d}\mathrm{u}\mathrm{c}\mathrm{t}\mathrm{s}$R−CO−Rhν​Free Radical Products

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2. Explain Claisen rearrangement and Cope rearrangement with mechanism.

हिंदी: Claisen rearrangement तथा Cope rearrangement को तंत्र सहित समझाइए।

मुख्य बिंदु:

• Pericyclic reactions
• Sigmatropic rearrangement
• Concerted mechanism
• Applications in organic synthesis
• Difference between Claisen and Cope rearrangement

Important rearrangement concept:
$[3,3]\text{–}\mathrm{S}\mathrm{i}\mathrm{g}\mathrm{m}\mathrm{a}\mathrm{t}\mathrm{r}\mathrm{o}\mathrm{p}\mathrm{i}\mathrm{c}\mathrm{R}\mathrm{e}\mathrm{a}\mathrm{r}\mathrm{r}\mathrm{a}\mathrm{n}\mathrm{g}\mathrm{e}\mathrm{m}\mathrm{e}\mathrm{n}\mathrm{t}$[3,3]-Sigmatropic Rearrangement

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Download B.Sc Organic Chemistry important questions and notes for Units 1 to 5 including substitution, addition, elimination, oxidation, reduction, photochemical and pericyclic reactions. Exam-oriented Hindi and English questions with mechanisms for 2026 university exams.

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isem se 2 imp question find krkre hindi aur english me likh do

Practical Aspects of Chemical Analysis – Important Questions

1. Explain the analysis of real samples and sources of errors in decomposition and dissolution.

हिंदी: वास्तविक नमूनों के विश्लेषण तथा decomposition एवं dissolution में होने वाली त्रुटियों के स्रोतों को समझाइए।

मुख्य बिंदु:

• Choice of analytical method
• Preparation of standard samples
• Moisture removal and drying
• Decomposition and dissolution of sample
• Sources of analytical errors

---

2. Explain automation in laboratory and classification of analytical methods.

हिंदी: प्रयोगशाला स्वचालन (Automation in Laboratory) तथा analytical methods के वर्गीकरण को समझाइए।

मुख्य बिंदु:

• Types of analytical methods
• Instrumental methods
• Analog and digital signals
• Automatic instruments
• Importance of laboratory automation
• Good laboratory practices (GLP)

ye 2 aur 3 unit he dono me se 2,2 question

Unit 2 – Electronic & Vibrational-Rotational Spectroscopy

Important Questions

1. Explain the basic principle, instrumentation and applications of UV-Visible Spectroscopy.

हिंदी: UV-Visible Spectroscopy के मूल सिद्धांत, उपकरण व्यवस्था एवं अनुप्रयोगों को समझाइए।

मुख्य बिंदु:

• Basic principle of UV-Vis spectroscopy
• Instrumentation
• Absorption of radiation
• Electronic transitions
• Applications in analysis

---

2. Explain Raman Effect and Stokes & Anti-Stokes lines.

हिंदी: Raman Effect तथा Stokes एवं Anti-Stokes रेखाओं को समझाइए।

मुख्य बिंदु:

• Raman scattering
• Vibrational Raman spectra
• Stokes and Anti-Stokes lines
• Intensity difference
• Rule of mutual exclusion

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Unit 3 – Molecular Characterization Techniques

Important Questions

1. Explain the basic principles and instrumentation of NMR Spectroscopy.

हिंदी: NMR Spectroscopy के मूल सिद्धांत एवं उपकरण व्यवस्था को समझाइए।

मुख्य बिंदु:

• Nuclear spin
• Magnetic field effect
• RF generator and receiver
• Signal recording
• Applications of NMR

Relevant concept:
$\mathrm{\Delta }E=h\nu$ΔE=hν

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2. Explain Mass Spectrometry and ionization techniques.

हिंदी: Mass Spectrometry तथा ionization techniques को समझाइए।

मुख्य बिंदु:

• Principle of mass spectrometry
• Mass-to-charge ratio (m/z)
• Electron impact ionization
• Chemical ionization
• Time of flight analyzer (TOF)
• Applications in molecular characterization

Important relation:
$\mathrm{m}\mathrm{/}\mathrm{z}$m/z

ye 4th unit he

Unit 4 – Atom Characterization Techniques

Important Questions

1. Explain the principle, instrumentation and working of Flame Photometry.

हिंदी: Flame Photometry के सिद्धांत, उपकरण व्यवस्था एवं कार्यविधि को समझाइए।

मुख्य बिंदु:

• Flame emission spectroscopy
• Characteristics of flame
• Instrumentation
• Working of flame photometer
• Applications in elemental analysis

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2. Explain the basic principles and instrumentation of Atomic Absorption Spectroscopy (AAS).

हिंदी: Atomic Absorption Spectroscopy (AAS) के मूल सिद्धांत एवं उपकरण व्यवस्था को समझाइए।

मुख्य बिंदु:

• Principle of atomic absorption
• Atomizer and monochromator
• Detector and sensitivity
• Detection limits
• Interferences in AAS
• Applications in quantitative analysis

Important concept:
$A+h\nu \to A^{\ast }$A+hν→A∗

unit 5

Unit 5 – Electro Analytical Techniques

Important Questions

1. Explain the principles and instrumentation of Polarography.

हिंदी: Polarography के सिद्धांत एवं उपकरण व्यवस्था को समझाइए।

मुख्य बिंदु:

• General principles of polarography
• Dropping mercury electrode
• Half-wave potential
• Cathodic and anodic waves
• Analysis of reversible polarographic wave

Important relation:
$i=kC$i=kC

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2. Explain Potentiometry and measurement of EMF of a cell.

हिंदी: Potentiometry तथा cell के EMF के मापन को समझाइए।

मुख्य बिंदु:

• Principle of potentiometry
• Reference and indicator electrodes
• Ion selective electrodes
• Measurement of electromotive force (EMF)
• Potentiometric titrations

Important equation:
$E_{cell}=E_{cathode}-E_{anode}$Ecell​=Ecathode​−Eanode​

Unit 6 – Optical and Advanced Chromatographic Techniques

Important Questions

1. Explain the principle, instrumentation and applications of Gas Chromatography (GC).

हिंदी: Gas Chromatography (GC) के सिद्धांत, उपकरण व्यवस्था एवं अनुप्रयोगों को समझाइए।

मुख्य बिंदु:

• Theory of GC
• Packed and capillary columns
• Carrier gas
• Flame ionization detector (FID)
• Thermal conductivity detector (TCD)
• Applications in chemical analysis

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2. Explain the theory and instrumentation of High Performance Liquid Chromatography (HPLC).

हिंदी: High Performance Liquid Chromatography (HPLC) के सिद्धांत एवं उपकरण व्यवस्था को समझाइए।

मुख्य बिंदु:

• Principle of HPLC
• Stationary and mobile phase
• UV detector and RI detector
• Fluorescence detector
• Separation process
• Applications in pharmaceutical and chemical analysis

Important concept:
$K=\frac{C_s}{C_m}$K=Cm​Cs​​

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