Organic Synthesis | Edexcel International A Level Chemistry Multiple Choice Questions 2017

11 mark

The melting temperature is determined for impure crystals of an organic compound.

When compared with a data book value for the pure compound, the measured melting temperature

will be the same as the true value
will be higher than the true value
will be lower than the true value
could be higher or lower than the true value

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1 mark

Benzenecarboxylic acid may be produced from benzene in a two-step synthesis.

q18-paper-5-jan-2021-edexcel-ial-chemistry

8.24 g of benzenecarboxylic acid was formed in this synthesis.

What mass of benzene was used?

3.48 g
5.27 g
19.51 g
30.52 g

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11 mark

But-2-ene-1,4-diol may be converted into 2-oxobutanedioic acid in a two-step synthesis through an intermediate compound W.

HOCH₂CH $=$ CHCH₂OH $\to_{Step 1}^{steam and H_{2} {SO}_{4}}$ W $\underset{Step 2}{\to}$ HO₂CCOCH₂CO₂H
but-2-ene-1,4-diol 2-oxobutanedioic acid

Identify the intermediate compound W and the reagent for Step 2.

		Compound W	Reagent for Step 2
☐	A	HOCH₂CH(OH)CH₂CH₂OH	LiAlH₄ in dry ether
☐	B	HOOCH₂CH $=$ CHCOOH	LiAlH₄ in dry ether
☐	C	OHCCH(OH)CH₂CHO	hot acidified K₂Cr₂O₇
☐	D	HOCH₂CH(OH)CH₂CH₂OH	hot acidified K₂Cr₂O₇

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Edexcel International A Level Chemistry

Topic Questions

5.6 Organic Synthesis