[Maximum number: 1]

An organic compound Z
- is oxidised by hot acidified potassium manganate(VII),
- reacts with sodium to give hydrogen.

What could be compound Z ?

A

$\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}$

B

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CHO}$

C

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{3}$

D

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COCH}_{3}$

[Maximum number: 1]

An organic compound X
- is unaffected by hot acidified potassium manganate(VII),
- reacts with ethanoic acid in the presence of concentrated sulfuric acid.

What is compound X ?

A

$\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{C}_{2} \mathrm{H}_{5}$

B

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COCH}_{3}$

C

$\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}$

D

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHOHCH}_{3}$

[Maximum number: 1]

Hydroxyethanal, $\mathrm{HOCH}_{2} \mathrm{CHO}$ , is heated under reflux with an excess of acidified potassium dichromate(VI) until no further oxidation takes place.

What is the skeletal formula of the organic product?

A

B

C

D

[Maximum number: 1]

What will react differently with the two isomeric alcohols, $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCH}_{2} \mathrm{OH}$ and $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHCH}_{2} \mathrm{CH}_{2} \mathrm{OH}$ ?

A

acidified aqueous potassium manganate(VII)

B

concentrated sulfuric acid

C

phosphorus pentachloride

D

sodium

[Maximum number: 1]

There are many non-cyclic alcohols that cannot be oxidised by warm acidified $\mathrm{MnO}_{4}^{-}$ ions. Alcohol X is the member of this set of alcohols with the lowest molecular mass.

How many moles of oxygen are required for the complete combustion of 1.0 mol of alcohol X ?

A

$3.5 \mathrm{~mol}$

B

$4.5 \mathrm{~mol}$

C

6.0 mol

D

6.5 mol

[Maximum number: 1]

Pentaerythritol is used as an intermediate in the manufacture of paint.

pentaerythritol

Which statement about pentaerythritol is correct?

A

It can be dehydrated by concentrated sulfuric acid to form an alkene.

B

Its empirical formula and its molecular formula are different.

C

It does not react with acidified potassium manganate(VII).

D

One mole of it gives two moles of hydrogen gas on reaction with an excess of sodium.

[Maximum number: 1]

The compound 'leaf alcohol' is partly responsible for the smell of new-mown grass.

\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CHCH}_{2} \mathrm{CH}_{2} \mathrm{OH}

leaf alcohol
What will be formed when 'leaf alcohol' is oxidised using an excess of hot, acidified $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}(\mathrm{aq})$ ?

A

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}(\mathrm{OH}) \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{2} \mathrm{CO}_{2} \mathrm{H}$

B

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COCOCH}_{2} \mathrm{CO}_{2} \mathrm{H}$

C

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CHCH}_{2} \mathrm{CO}_{2} \mathrm{H}$

D

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CO}_{2} \mathrm{H}$ and $\mathrm{HO}_{2} \mathrm{CCH}_{2} \mathrm{CO}_{2} \mathrm{H}$

[Maximum number: 1]

A compound Y is treated with warm acidified potassium dichromate(VI). The resulting organic product gives an orange precipitate with 2,4-dinitrophenylhydrazine reagent but does not give a silver mirror with Tollens' reagent.

What is Y?

A

butan-1-ol

B

butan-2-ol

C

butanal

D

2-methylpropan-2-ol

[Maximum number: 1]

Which sequence of reagents may be used in the laboratory to convert propan-1-ol into 2-bromopropane?

A

concentrated sulfuric acid, followed by bromine

B

concentrated sulfuric acid, followed by hydrogen bromide

C

ethanolic sodium hydroxide, followed by bromine

D

ethanolic sodium hydroxide, followed by hydrogen bromide

[Maximum number: 1]

When an organic compound, Q, is treated with phosphorus pentachloride, fumes of hydrogen chloride are evolved. When Q is warmed with acidified aqueous potassium dichromate(VI), the solution turns green.

What is Q ?

A

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHO}$

B

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CO}_{2} \mathrm{H}$

C

$\mathrm{CH}_{3} \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{3}$

D

$\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}$