Which one of the following represents valeraldehyde?
- CH3CH2CH2CH2CHO
- CH3CH(CH3)CH2CHO
- CH3CH(OCH3)CHO
- (CH3)2CHCHO
- CH3CH2CH(CH3)CHO
The Correct Option is A
Approach Solution - 1
Valeraldehyde is a five-carbon aldehyde with the chemical formula C₅H₁₀O, and it is represented as CH₃CH₂CH₂CH₂CHO. This structure corresponds to option (A), where the aldehyde group (CHO) is attached to a four-carbon chain (butyl group). The other options represent different aldehydes or compounds, but not valeraldehyde.
The correct option is (A) : CH3CH2CH2CH2CHO
Approach Solution -2
Valeraldehyde, also known as pentanal, is a five-carbon aldehyde. The general formula for an aldehyde is R-CHO, where R is an alkyl group.
Therefore, valeraldehyde should have a straight chain of four carbon atoms attached to the aldehyde group (-CHO).
Analyzing the given options:
- CH3CH2CH2CH2CHO: This represents a straight chain of 5 carbons with an aldehyde group at the end, which is pentanal or valeraldehyde.
- CH3CH(CH3)CH2CHO: This is an isomer of pentanal, specifically 3-methylbutanal.
- CH3CH(OCH3)CHO: This contains a methoxy group and is not valeraldehyde.
- (CH3)2CHCHO: This is isobutanal, a four-carbon aldehyde.
- CH3CH2CH(CH3)CHO: This is an isomer of pentanal, specifically 2-methylbutanal.
Only the first option, CH3CH2CH2CH2CHO, represents a straight chain five-carbon aldehyde.
Therefore, the answer is CH3CH2CH2CH2CHO.
Top Questions on Uses of Aldehydes and Ketones
- Which of the following compounds will give a positive Iodoform test?
- BITSAT - 2025
- Chemistry
- Uses of Aldehydes and Ketones
- On heating an aldehyde with Fehling’s reagent, a reddish-brown precipitate is obtained due to the formation of
- KEAM - 2024
- Chemistry
- Uses of Aldehydes and Ketones
- What are ‘X’ and ‘Y’ in the following reactions?
Acetal $\xrightarrow{X}$ CH$_3$COCH$_3$ $\xrightarrow{Y}$ Oxime- AP EAPCET - 2023
- Chemistry
- Uses of Aldehydes and Ketones
- The correct order of reactivity of the following towards nucleophilic addition reactions is: \[ \text{I. CH}_3\text{COCH}_3,\quad \text{II. CH}_3\text{CH}_2\text{CHO},\quad \text{III. ClCH}_2\text{CHO} \]
- AP EAPCET - 2023
- Chemistry
- Uses of Aldehydes and Ketones
- Which of the following is a hemiacetal?
- AP EAPCET - 2023
- Chemistry
- Uses of Aldehydes and Ketones
Questions Asked in KEAM exam
- Benzene when treated with Br\(_2\) in the presence of FeBr\(_3\), gives 1,4-dibromobenzene and 1,2-dibromobenzene. Which type of reaction is this?
- KEAM - 2025
- Haloalkanes and Haloarenes
- 10 g of (90 percent pure) \( \text{CaCO}_3 \), treated with excess of HCl, gives what mass of \( \text{CO}_2 \)?
- KEAM - 2025
- Stoichiometry and Stoichiometric Calculations
- Evaluate the following limit: $ \lim_{x \to 0} \frac{1 + \cos(4x)}{\tan(x)} $
- KEAM - 2025
- Limits
- Given that \( \mathbf{a} \times (2\hat{i} + 3\hat{j} + 4\hat{k}) = (2\hat{i} + 3\hat{j} + 4\hat{k}) \times \mathbf{b} \), \( |\mathbf{a} + \mathbf{b}| = \sqrt{29} \), \( \mathbf{a} \cdot \mathbf{b} = ? \)
- KEAM - 2025
- Vector Algebra
- In an equilateral triangle with each side having resistance \( R \), what is the effective resistance between two sides?
- KEAM - 2025
- Combination of Resistors - Series and Parallel