Question 11 of 26beginner🔧 ApplyShort Answer3 marks

Write the IUPAC names of the following ketones and aldehydes. Wherever possible, give also common names. (i) CH₃CO(CH₂)₄CH₃ (ii) CH₃CH₂CHBrCH₂CH(CH₃)CHO (iii) CH₃(CH₂)₅CHO (iv) Ph-CH=CH-CHO (v) PhCOPh

(i)
Answer

IUPAC: Heptan-2-one; Common: Methyl n-pentyl ketone

(ii)
Answer

IUPAC: 4-Bromo-2-methylhexanal; Common: γ-Bromo-α-methylcaproaldehyde

(iii)
Answer

IUPAC: Heptanal; Common: Enanthaldehyde

(iv)
Answer

IUPAC: 3-Phenylprop-2-enal; Common: Cinnamaldehyde

(v)
Answer

IUPAC: Diphenylmethanone; Common: Benzophenone

Explanation

For ketones, IUPAC names use the suffix '-one' with position number, while common names name the two alkyl/aryl groups attached to carbonyl. For aldehydes, IUPAC names use the suffix '-al' with the carbonyl carbon as position 1. Common names for aldehydes are derived from corresponding carboxylic acids, with substituent positions indicated by Greek letters (α, β, γ, δ) starting from the carbon adjacent to the aldehyde group. Benzophenone is explicitly mentioned in the context as a historical common name for diphenyl ketone.

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