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In CH₃CH₂C≡CH (but-1-yne), there are 9 σ bonds: 5 C-H, 2 C-C, 2 from C≡C.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Structural Isomerism - Chain Position Functional Metamerism
In CH₃CH=CHCH=CH₂ (penta-1,3-diene), each of the two double bonds has 1 π bond, totaling 2 π bonds.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Electronic Effects - Inductive Mesomeric Hyperconjugation and Resonance
In CH₂=CHCH₂CH₃ (but-1-ene), there are 11 σ bonds: 8 C-H, 2 C-C, 1 from C=C.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Classification and Nomenclature of Organic Compounds - IUPAC
In CH₂=CH-CH₃ (propene), there are 8 single bonds (C-H and C-C) and 1 double bond (C=C). The double bond consists of 1 σ and 1 π, so total σ bonds = 8 (single) + 1 (from double) = 9.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Classification and Nomenclature of Organic Compounds - IUPAC
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