The IUPAC name of an organic compound is 4,4-dimethylpent-2-yne - NSC Physical Sciences - Question 2 - 2019 - Paper 2
Question 2
The IUPAC name of an organic compound is 4,4-dimethylpent-2-yne.
2.1.1 Write down the GENERAL FORMULA of the homologous series to which this compound belongs.
2.1.... show full transcript
Worked Solution & Example Answer:The IUPAC name of an organic compound is 4,4-dimethylpent-2-yne - NSC Physical Sciences - Question 2 - 2019 - Paper 2
Step 1
Write down the GENERAL FORMULA of the homologous series to which this compound belongs.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The general formula for alkynes is represented as CₙH₂ₙ₋₂, where n is the number of carbon atoms in the molecule. For the compound 4,4-dimethylpent-2-yne, n is 5 (since it has five carbon atoms), thus the general formula is C₅H₈.
Step 2
Write down the STRUCTURAL formula of this compound.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The structural formula of 4,4-dimethylpent-2-yne can be represented as:
CH3
|
CH3-C-C≡C-CH3
|
H
This shows the positions of the two methyl groups and the triple bond.
Step 3
Define the term positional isomer.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Positional isomers are compounds that have the same molecular formula and the same functional group but differ in the position of the functional group or substituents on the carbon chain.
Step 4
IUPAC name of its POSITIONAL isomer.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The IUPAC name of the positional isomer is Pentan-2-ol.
Step 5
Structural formula of its FUNCTIONAL isomer.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The structural formula of a functional isomer, such as an aldehyde, can be represented as:
O
||
H3C-CH2-CH2-CH=O
This represents Pentanal.
Step 6
Is this a PRIMARY, SECONDARY or TERTIARY alcohol? Give a reason for the answer.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The compound is a tertiary alcohol since the carbon atom connected to the hydroxyl group (–OH) is bonded to three other carbon atoms, indicating it is a tertiary structure.
Step 7
Write down the IUPAC name of the organic product formed when this compound undergoes an elimination reaction.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The IUPAC name of the major organic product formed during the elimination reaction is 2-methylbut-2-ene.
