Comments on: O Levels Chemistry 2008 Exam Question: Organic Chemistry in Paper 1 (MCQs)

By: Harshada Adel

Harshada Adel — Mon, 14 Nov 2011 05:39:02 +0000

Question 1:Ans. A,Kerosene is used only for cooking purpose as it is crude and other applications make use of fractionally seperated paraffins with range of calorific values.

Question 2:Ans. B, Alkanes belong to the general formula CnH2n+2,They are non polar so have low boiling point as a resul they are inflammable;And they show substitution reaction by chlorine eitherr by radicle or carboniyum ion as an intermediate.

Question 3:Ans D;Carbon dioxide dissolves in sodium hydroxide to give sodium bicarbonate and as ethane is saturated hydrocarbon it does not show any substitution reaction with bromine also it can be oxidise to carbondixide and methane with the liberation of hydrogen.

By: Nicole

Nicole — Sun, 02 May 2010 10:20:42 +0000

Hi Mr Chua!

Ans 1: A

I don’t get it, why is the answer B? I thought natural gases are used in cooking, not kerosene ?? *confused.

Ans 2: B
Ans 3: D

Thanks!!

By: Umar arif

Umar arif — Sat, 23 Jan 2010 07:49:04 +0000

my answer are ,B,B and D because th third question bromine decolorised only in
saturated hydro carbons A and C are not saturated they are unsaturated and the
answer will be from B and D my answer is D because in combustin

By: sean

sean — Thu, 15 Oct 2009 04:44:58 +0000

Hi Garcia,

Where are you from?

In domestic cooking and power stations, we do not generally use kerosene if other suitable choices of fuel are present.

Hope this information helps. =)

To Your Academic Success in Chemistry,
Sean Chua

By: sean

sean — Thu, 15 Oct 2009 04:29:02 +0000

Hi James,

General Molecular Formula for Alkanes Homologous Series is CnH2n+2.

Hope this information helps. =)

To Your Academic Success in Chemistry,
Sean Chua