Organic chemistry test questions - OCR 21st Century - GCSE Chemistry (Single Science) Revision

1

What is the general formula for an alkane?

C_nH_2n+1

C_nH_2n+2

C_nH_2n

2

What is the general formula for an alkene?

C_nH_2n+1

C_nH_2n+2

C_nH_2n

3

What is the functional group of an alkene?

OH group

COOH group

C=C

4

What is the functional group of an alcohol?

OH group

COOH group

C=C

5

What is the functional group of a carboxylic acid?

OH group

COOH group

C=C

6

What is produced during the complete combustion of an alkane?

Carbon monoxide and water

Carbon dioxide and water

Carbon dioxide only

7

What chemical test may be used to distinguish between an alkane or an alkene?

Bromine turns from orange-brown to colourless when added to an alkane, but not when added to an alkene

Bromine turns from orange-brown to colourless when added to an alkene, but not when added to an alkane

Bromine turns from colourless to orange-brown when added to an alkene but not when added to an alkane

8

What type of substance is formed by the addition reaction of an alkene with water?

An alcohol

A carboxylic acid

Another alkane

9

What substance is produced when ethanol is oxidised?

Ethanoic acid

Propanoic acid

Ethene

10

What is the structural formula of propanoic acid?

CH₃CH₂CH₂COOH

CH₃COOH

CH₃CH₂COOH