Question

1. Which of the following statements about alkanes is not true? A) Alkanes are aliphatic hydrocarbons. B) Alkanes contain only C-C and C-H o bonds. C) Alkanes are acyclic or cyclic. D) Acyclic alkanes have two fewer H atoms than cyclic alkanes with the same n of carbons. 2. What is the approximate C-C-C bond angle in propane? A) 90° B) 109.5°C) 120° D) 180° 3 What is the hybridization of a carbon atom in an alkane? A) sp B) sp?C) sp D) p 4. Which of the following compounds has primary, secondary and tertiary hydrogen atoms? A) Pentane B) Hexane C) 2-Methylpentane D) 2,2-Dimethylpentane

Answer 1

H2 therehe TCH, CH2 CH2 CH3 Alyclic alkane "21 CH2 CH₂ - CH2 ( 14 hydrogen & eyclic alkane - 6 Carbon) ( 12 hydrogens & ' 6 Cambon) Therefore, Acyclic alkane have two more h atom than Cydic alkancs with same number of Carbons. Correct option ® 2. H3 C CH2 As propane is a tetrahedral snoeale • 109.50 hence approximate e-c-cbond angle is 109.50 3. Hybridization of alkane is sp3. 1. Hzc ha Tertiary H) 1 H₂c-e-Erl, "che-CH3 (secondary H) (Primary (2-methyl pentane) 4.