Three chemical reactions are shown.
1 catalytic addition of steam to ethene
2 combustion of ethanol
3 fermentation of glucose
In which of the reactions does the relative molecular mass of the carbon-containing compound
decrease?

1

and

2

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1

only

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2

and

3

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3

only

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Solution

The correct option is D $2$ and $3$
The reaction of ethene with steam to form ethanol can be reversed. This allows ethanol to be converted into ethene. A catalyst of hot aluminium oxide is used to speed up the reaction.
$ethanol\xrightarrow~ethene+steam$
$C_{2}H_{5}OH\xrightarrow~C_{2}H_{4}+H_{2}O$
This is called a dehydration reaction.

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Three chemical reactions are shown.1 catalytic addition of steam to ethene2 combustion of ethanol3 fermentation of glucoseIn which of the reactions does the relative molecular mass of the carbon-containing compounddecrease?

The correct option is D 2 and 3The reaction of ethene with steam to form ethanol can be reversed. This allows ethanol to be converted into ethene. A catalyst of hot aluminium oxide is used to speed up the reaction.This is called a dehydration reaction.

Three chemical reactions are shown.
1 catalytic addition of steam to ethene
2 combustion of ethanol
3 fermentation of glucose
In which of the reactions does the relative molecular mass of the carbon-containing compound
decrease?