Which ONE of the following compounds has the LOWEST melting point?
A
Hexane
B
Ethane
C
Butane
D
Octane
When CH2 = CH2 is converted to CH3CH3, the type of reaction is …
A
hydration - NSC Physical Sciences - Question 1 - 2022 - Paper 2
Question 1
Which ONE of the following compounds has the LOWEST melting point?
A
Hexane
B
Ethane
C
Butane
D
Octane
When CH2 = CH2 is converted to CH3CH3, the type of reaction i... show full transcript
Worked Solution & Example Answer:Which ONE of the following compounds has the LOWEST melting point?
A
Hexane
B
Ethane
C
Butane
D
Octane
When CH2 = CH2 is converted to CH3CH3, the type of reaction is …
A
hydration - NSC Physical Sciences - Question 1 - 2022 - Paper 2
Step 1
Which ONE of the following compounds has the LOWEST melting point?
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Answer
Among the compounds listed, ethane (B) has the lowest melting point. This is due to its small molecular size and weak London dispersion forces compared to larger molecules like butane, hexane, and octane.
Step 2
When CH2 = CH2 is converted to CH3CH3, the type of reaction is …
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Answer
This reaction is classified as D. hydrogenation. During hydrogenation, the double bond between carbons in ethylene is saturated by adding hydrogen, converting it to ethane.
Step 3
Which ONE of the following compounds in solution will change the colour of bromothymol blue?
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Answer
The correct compound is B. CH3CH2COOH (acetic acid). This compound is an acid and will lower the pH of the solution, causing bromothymol blue to change colour from blue to yellow.
