Question 1 of 26beginner🔧 ApplyShort Answer3 marks

Write the structures of the following compounds. (i) α-Methoxypropionaldehyde (ii) 3-Hydroxybutanal (iii) 2-Hydroxycyclopentane carbaldehyde (iv) 4-Oxopentanal (v) Di-sec. butyl ketone (vi) 4-Fluoroacetophenone

(i)
Answer

CH₃-CH(OCH₃)-CHO

(ii)
Answer

CH₃-CH(OH)-CH₂-CHO

(iii)
Answer

Cyclopentane ring with -CHO and -OH at positions 1 and 2 respectively

(iv)
Answer

CH₃-CO-CH₂-CH₂-CHO

(v)
Answer

(CH₃-CH₂-CH(CH₃)-)₂C=O

(vi)
Answer

4-F-C₆H₄-CO-CH₃

Explanation

This question tests understanding of IUPAC nomenclature and common names of aldehydes and ketones. Students must identify the parent chain, functional groups, and substituents. For α-substituted compounds, the α-carbon is adjacent to the carbonyl carbon. 'Carbaldehyde' indicates -CHO attached directly to a ring. 'Oxo' indicates a ketone group as substituent. Sec-butyl refers to the secondary butyl group CH₃CH₂CH(CH₃)-.

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