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#organic chemistry

772 public questions tagged with this topic.

CHEMISTRY

What is the total number of pi ( π ) bonds in CH₃C#CCH₃ ?

In CH₃C#CCH₃, the triple bond (C≡C) consists of 1 sigma and 2 pi bonds. There are no other multiple bonds. Total π bonds = 2. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

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CHEMISTRY

How many pi bonds are present in the CO₂ molecule?

CO₂ has 2 double bonds (each with 1 sigma and 1 pi), totaling 2 pi bonds. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.

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CHEMISTRY

What is the bond angle around the carbon atom in CH₂=CH₂ ?

In CH₂=CH₂ (ethene), each carbon is sp² hybridized, forming a trigonal planar shape with bond angles of 120°. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.

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CHEMISTRY

What is the bond angle around the nitrogen atom in CH₃NH₂ ?

The nitrogen in CH₃NH₂ is sp³ hybridized (3 bonds, 1 lone pair), resulting in a tetrahedral electron geometry, but a bond angle of approximately 107° due to lone pair repulsion.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII), Chapter: Chemical Bonding (Latest NCERT 2026-27), Topic: Hybridization of nitrogen in CH₃NH₂, sp³ hybridization and pyramidal geometry

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CHEMISTRY

How many sigma bonds are present in the C₂H₄ molecule?

C₂H₄ has a double bond (1 sigma, 1 pi) between carbons and 4 single bonds (4 sigma) to hydrogens. Total sigma bonds = 1 + 4 = 5. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

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CHEMISTRY

What is the mass of one mole of ethanol (Câ‚‚Hâ‚…OH)? (Atomic masses: C = 12, H = 1, O = 16)

Given: What is the mass of one mole of ethanol (C₂H₅OH)? (Atomic masses: C = 12, H = 1, O = 16) These values define the system as per NCERT data. Formula: Molar mass = (2 × 12) + (6 × 1) + 16 = 46 g/mol.. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Substituting values like 1.2 × 10⁻⁵, 236 J kg⁻¹ K⁻¹, CH₃CH₂NH₂ etc. into the formula and simplifying step by step. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.

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CHEMISTRY

Which of the following compounds undergoes the Perkin reaction?

The Perkin reaction involves the condensation of aromatic aldehydes with acetic anhydride to form α, β-unsaturated carboxylic acids. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.

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CHEMISTRY

What is the common name of CH₃CH₂COOH ?

CH₃CH₂COOH, a three-carbon carboxylic acid, is commonly known as propionic acid. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

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CHEMISTRY

What is the common name of HCOOH ?

HCOOH, a one-carbon carboxylic acid, is commonly known as formic acid. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

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CHEMISTRY

Which of the following compounds undergoes decarboxylation most easily?

β-Keto acids undergo decarboxylation more easily due to the stability of the enolate intermediate. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.

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CHEMISTRY

Which of the following compounds is most acidic?

Trifluoroacetic acid is the most acidic due to the strong electron-withdrawing effect of fluorine atoms. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.

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