Introduction to Organic Chemistry
6 marks · NormalState the typical number of bonds formed by each of the following atoms in an organic molecule: carbon, hydrogen, oxygen.
An alcohol has the molecular formula C3H8O. Using your answer to part a, draw the displayed formula for this alcohol.
Name this alcohol according to IUPAC rules.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) — · must show Carbon: 4 bonds, Hydrogen: 1 bond, Oxygen: 2 bonds
(b) — · must show Three carbons in chain, –OH group on terminal or middle carbon, Correct number of hydrogens and bonds
(c) propan-1-ol or propan-2-ol · must show Accept either propan-1-ol or propan-2-ol
Show mark scheme and worked solution
Marking points
CB1 (a) · 1 mark · States carbon forms 4 bonds
CB2 (a) · 1 mark · States hydrogen forms 1 bond and oxygen forms 2 bonds
DB1 (b) · 2 marks · Fully displayed formula, with three carbon atoms in a chain, an -OH group on either terminal or central carbon, correct H bonding
NC1 (c) · 2 marks · Correct IUPAC name: propan-1-ol or propan-2-ol
Worked solution
(a) Carbon forms 4 bonds, hydrogen forms 1 bond, and oxygen forms 2 bonds in organic molecules.
(b) C3H8O could be either propan-1-ol or propan-2-ol. Draw the displayed formula for each:
(c) The IUPAC names are propan-1-ol or propan-2-ol.