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#chemistry exam practice

2 public questions tagged with this topic.

In the estimation of carbon and hydrogen, 0.18 g of a compound gave 0.528 g of CO₂ and 0.108 g of H₂O. What is the empir

Mass of C = (12/44) × 0.528 = 0.144 g. Mass of H = (2/18) × 0.108 = 0.012 g. Ratio C:H = (0.144/12)/(0.012/1) = 1:1. Empirical formula = CH.

Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Structural Isomerism - Chain Position Functional Metamerism

A compound with 9 σ bonds and 1 π bond has a molecular formula of C₄H₆. Which carbon has a bond angle closest to 109.5°?

CH₃CH=CHCH₂ fits C₄H₆ with 9 σ (6 C-H, 2 C-C, 1 from C=C) and 1 π (C=C). The first carbon (CH₃) is sp³, with a 109.5° bond angle.

Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Structural Isomerism - Chain Position Functional Metamerism