Chemistry Quiz June 2016 Q14-40

Select the correct answer

• A

• B

• C

• D

Select the correct answer

• 1,1-dibromo-2-propylcyclopentane

• 1,2-dibromo-2-propylcyclopentane

• 1,4-dibromooctane

• 1,5-dibromooctane

Select the correct answer

• A

• B

• C

• D

An organic compound T undergoes the following reactions.

● T is oxidised by hot, acidified potassium manganate(VII).

● T reacts with sodium to give hydrogen.

What could be compound T?

• CH₃CH₂CH(OH)CH₃

• CH₃CH₂CH₂CHO

• (CH₃)₃COH

• CH₃CH₂COCH

Compound X is treated with two reagents successively, forming compound Z.

What could be Z?

• 
• 
• 

Which reagent may be used to distinguish between propanone and ethanol?

• 2,4-dinitrophenylhydrazine

• bromine water

• Fehling’s reagent

• Tollens’ reagent

Which compound is chiral?

• 1-chloro-3-methylbutane

• 2-chloro-2-methylbutane

• 2-chloro-3-methylbutane

• 3-chloropentane

An atom of calcium-48 can form a 2+ ion.

Which statements about this ion are correct?

1 It has 20 protons.

2 It has 28 neutrons.

3 It has 22 electrons.

• 1, 2 and 3 are correct

• 1 and 2 only are correct

• 2 and 3 only are correct

• 1 only is correct

Four elements, W, X, Y and Z, have electronic configurations as shown.

W 2,4

X 2,6

Y 2,8,2

Z 2,8,8,1

Which formulae represent compounds that have boiling points below room temperature?

1 WX₂

2 YX

3 Z₂X

• 1, 2 and 3 are correct

• 1 and 2 only are

• 2 and 3 only are correct

• 1 only is correct

Which statements about enthalpy changes are correct?

1 The enthalpy change of atomisation is always positive.

2 The enthalpy change when a C–C bond is broken is positive.

3 The enthalpy change of neutralisation of a weak acid is always negative.

• 1, 2 and 3 are correct

• 1 and 2 only are correct

• 2 and 3 only are correct

• 1 only is correct