This set of Organic Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Alkanes”.
1. Select the incorrect statement regarding alkanes
a) It is otherwise known as Paraffin
b) It is an acyclic saturated hydrocarbon
c) In alkanes, C-C bonds are single
d) Alkanes have the general formula CnH2n
2. Identify the simplest alkane
a) Methane
b) Methene
c) Ethane
d) Ethene
3. Select the minimum number of carbon atoms, a molecule must possess so as to be regarded as a higher alkane
a) 15
b) 16
c) 17
d) 18
4. Identify the incorrect statement
a) Alkanes with repeated –CH2- units constitute a homologus series
b) They are very reactive
c) They have very less biological activity
d) Petroleum and natural gas are the main sources of alkanes
5. Which among the following is not an alkane isomer with 6 carbon atoms
a) Hexane
b) 2,3-dimethylbutane
c) 2,2-dimethylbutane
d) Neopentane
6. The other name for branched chain alkanes is
a) Paraffins
b) Isoparaffins
c) Neoparaffins
d) Naphthenes
7. Select the incorrect statement regarding the boiling points of alkanes
a) Boiling point increases with stronger Vander Waal’s forces
b) Surface area is the only factor which determines the boiling point of alkane
c) Boiling point of straight chain alkanes is greater than that of branched chain alkanes
d) The boiling point of cycloalkanes is always higher than that of linear
ANSWERS
- Answer: d
Explanation: Alkanes have the general formula CnH2n+2, i.e; they have two additional hydrogen atoms in comparison with the others.
- Answer: a
Explanation: Methane, called the parent molecule, is the simplest among the alkanes and it has the simplest formula with one carbon atom.
- Answer: c
Explanation: A molecule with more than 17 carbon atoms are regarded as higher alkanes such as waxes and solids.
- Answer: b
Explanation: Alkanes in general are not very reactive, but they are associated with functional groups which are reactive.
- Answer: d
Explanation: Neopentane is an isomer with 5 carbon atoms and hence it is not an isomer with 6 carbon atoms.
- Answer: b
Explanation: Linear and branched chain alkanes have difference in their physical properties and hence they are given different prefix like n- and iso- re
- Answer: b
Explanation: Number of electrons and surface area are the two factors which determine the boiling point.
Mugisa GeofreyMugisa Geofrey Zziwa is a learning facilitator with Ultimate MultiMedia Consult. With knowledge of the following topics: Digital Pedagogy training or digital teaching skills, how to integrate ICT in teaching. Journalism and the Internet/Computers (How internet helps journalism) Basic web design & CMS and Multimedia Content publishing Digital security and safety basics for journalists Best practices for ensuring safety online Data Mashups Collaborative digital content development tools Live streaming and Live reporting Immersive Storytelling tools and practices Among others I have conducted a number of trainings which include: • Multimedia Journalism and Digital Safety training for university Students held in Makerere University, Kampala International University and Cavendish University and sponsored by the American Embassy Uganda. • Digital Pedagogy training for Science Technology Engineering and Mathematics (STEM) Teachers held in Iganga Girls SSS in Iganga District for Eastern region Uganda, St. Maria Gorretti in MPigi District for Central region Uganda, and Teso College ALOET for the Karamoja region Uganda. Sponsored by Forum for African Women Educationalists Uganda (FAWEU) Training Teachers on integration of ICT in teaching and delivering lessons to students. • Digital Pedagogy at American Center for Teachers by Teachers In Need (TIN) Uganda. • Facilitator on Digital Pedagogy with ICT Teachers Association Uganda (ITAU) at American Center, Kyebambe Girls SSS in FortPortal for western region Uganda, Dr. Obote College Boro Boro Lira for Nothern Region Uganda.
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