Drawing and naming the alcohols
4 marks · NormalThis question is about different alcohols up to four carbon atoms.
Draw the displayed formula of ethanol. Show all bonds clearly.
State the molecular formula of butan-1-ol.
Give the structural formula for methanol.
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.
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(a) — · must show two carbons connected, appropriate number of H on each C, O–H bond shown on second carbon
(b) C4H10O
(c) CH3OH
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Correct backbone and bonds (two C atoms joined, each H drawn and O–H bonded on second C)
B2 (a) · 1 mark · All bonds shown clearly, including O–H; all atoms present
B3 (b) · 1 mark · Correct molecular formula for butan-1-ol: C4H10O
B4 (c) · 1 mark · Correct structural formula for methanol: CH3OH
Worked solution
a) Displayed formula for ethanol:
with three Hs attached to the first C, two Hs to the second C - draw in all bonds/
b) Molecular formula of butan-1-ol: C4H10O
c) Structural formula of methanol: CH3OH