Chemistry VIP Triple E Session

Introduction

• Welcome by Ricksha Koshan, chemistry master teacher.
• Focus on chemistry for VITEEE: easy, predictable, and scoring.
• Session covers organic, physical, and inorganic chemistry questions.
• Emphasis on organic chemistry questions.

Organic Chemistry Questions

Nucleophilic Addition Reaction

• Most reactive towards nucleophilic addition: electron deficiency on carbon attracts nucleophiles.
• Electron withdrawing groups show more reactivity.
• Example: Carbon attached to benzene with double-bonded oxygen (more electron-deficient).

Cumene Process

• Reaction: cumene with O2 followed by HCl treatment.
• Naming reactions are crucial.
• Products: Phenol and acetone.

Conformers

• Ethane and cyclohexane: stability based on repulsions.
• Eclipse and staggered conformers: staggered is more stable.
• Cylohexane has chair, boat, and twist-boat conformers; Chair is most stable.

Hyperconjugation

• Count hyperconjugable hydrogens to determine stability.
• Example: 10 alpha hydrogens lead to 10 hyperconjugating structures.

Reaction Mechanisms

• Different reagents lead to different reactions (e.g., potassium ethoxide as E2 base).
• Stereochemistry in products (e.g., trans vs. cis).

Acidity and Basicity

• Acidity: Stability of conjugate base (anion).
• Basicity: Electron availability.
• GOC factors: backbonding, aromaticity, resonance, hyperconjugation, inductive effects.

Enolines

• Aromaticity, anti-aromaticity, and non-aromaticity in enolines.
• Specific enolines (e.g., 8, 10, 12) are non-aromatic due to structural constraints.

Ring Expansion and Contraction

• Carbenes and positive charges lead to ring expansion.
• Specific positions lead to ring contraction.

Electrophilicity in SN1 Reactions

• Stability of carbocations in bridgehead and tertiary positions.

Rearrangements and Effects

• Rearrangement during SN1 reactions.
• Markovnikov and anti-Markovnikov rules in additions.

Williamson Ether Synthesis

• Formation of ethers from RX and RO-Na.
• Prefer primary alkyl halides.

Other Important Reactions

• Aldol condensation, Gabriel Phthalimide reaction, and more discussed with mechanisms.

Physical Chemistry Questions

Bohr Orbit Radius

• Calculation for hydrogen's excited states.

Thermodynamics

• Hess's Law: constructing reactions to determine enthalpy changes.

Chemical Kinetics

• Order determination using half-life relationships.
• Arrhenius equation for temperature and rate constant relationships.

Electrochemistry

• Relation of standard potentials and equilibrium constants.
• Identifying metal reductions and oxidations.

Colligative Properties

• Boiling point elevation and freezing point depression.
• Calculations involving molality and want factors.

Inorganic Chemistry Questions

Molecular Shapes and Hybridization

• Use of VSEPR theory for predicting molecular shapes.
• Calculation of hybridization for central atoms.

Paramagnetism and Diamagnetism

• Determining unpaired electrons in molecular orbitals.

Coordination Chemistry

• Magnetic moments and color in complexes.
• Ligand field theory and oxidation states.

Miscellaneous

• Effects of strong oxidizing agents and specific reactions (e.g., KMnO4 with KI).

Study Tips

• Revise formulas, naming reactions, and exceptions.
• Use provided video resources for brush-up sessions.
• Stay calm and focused during exams.