Leaving Cert Chemistry Organic Chemistry: Study the reaction scheme below

Study the reaction scheme below and answer the questions that follow - Leaving Cert Chemistry - Question 8 - 2019

Question 8

Study the reaction scheme below and answer the questions that follow. (a) Name the alcohol W, the aldehyde X and the carboxylic acid Y. (b) Which one of the three ... show full transcript

Worked Solution & Example Answer:Study the reaction scheme below and answer the questions that follow - Leaving Cert Chemistry - Question 8 - 2019

Step 1

Name the alcohol W, the aldehyde X and the carboxylic acid Y.

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Answer

W: methanol (formaldehyde) X: methanal (formic acid) Y: HCOOH (methanoic acid)

Step 2

Which one of the three compounds (i) is present in the sting of nettles?

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Answer

Y: HCOOH (formic acid) is present in the sting of nettles.

Step 3

Which one of the three compounds (ii) makes up about 10% of methylated spirit?

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Answer

W: CH3OH (methanol) makes up about 10% of methylated spirit.

Step 4

Which one of the three compounds (iii) is gaseous at room temperature?

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Answer

X: HCHO (methanal) is gaseous at room temperature.

Step 5

Draw the structure of a molecule of X showing all the atoms and bonds present.

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Answer

The structure of a molecule of X (HCHO) is:

  H
  |
H-C=O
  |
  H

Note: The molecule consists of one carbon atom, one oxygen atom, and four hydrogen atoms.

Step 6

Which one of the molecules W, X or Y has a tetrahedrally bonded carbon atom?

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Answer

W: CH3OH (methanol) has a tetrahedrally bonded carbon atom.

Step 7

What term is used to describe the geometry around the carbon atom in the other two molecules?

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Answer

The term used to describe the geometry around the carbon atom in the other two molecules is "planar/trigonal."

Step 8

State the type of organic reaction involved in these conversions.

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Answer

The type of organic reaction involved in these conversions is oxidation/reduction.

Step 9

Identify a suitable reagent for these conversions.

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Answer

A suitable reagent for these conversions is acidified KMnO4 (potassium permanganate) or acidified K2Cr2O7 (potassium dichromate).

Step 10

Copy, complete, and balance the equation above to show the complete combustion of W in oxygen.

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Answer

The balanced equation for the complete combustion of W (methanol) in oxygen is:

ightarrow 2 ext{CO}_2 + 2 ext{H}_2 ext{O}$$

Study the reaction scheme below and answer the questions that follow - Leaving Cert Chemistry - Question 8 - 2019

Worked Solution & Example Answer:Study the reaction scheme below and answer the questions that follow - Leaving Cert Chemistry - Question 8 - 2019

Name the alcohol W, the aldehyde X and the carboxylic acid Y.

Which one of the three compounds (i) is present in the sting of nettles?

Which one of the three compounds (ii) makes up about 10% of methylated spirit?

Which one of the three compounds (iii) is gaseous at room temperature?

Draw the structure of a molecule of X showing all the atoms and bonds present.

Which one of the molecules W, X or Y has a tetrahedrally bonded carbon atom?

What term is used to describe the geometry around the carbon atom in the other two molecules?

State the type of organic reaction involved in these conversions.

Identify a suitable reagent for these conversions.

Copy, complete, and balance the equation above to show the complete combustion of W in oxygen.

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