(i) Write the IUPAC names of the following compounds: (a) CH₃CH₂CH₂OH (b) CH₃CH₂Br (c) CH₃COCH₂CH₃ (ii) Which…

Question

(i) Write the IUPAC names of the following compounds:
    (a) CH₃CH₂CH₂OH
    (b) CH₃CH₂Br
    (c) CH₃COCH₂CH₃
(ii) Which of the above compounds belongs to the ketone functional group?

Accepted Answer

## Model Answer **(i) IUPAC Names:** (a) **CH₃CH₂CH₂OH** — It has 3 carbon atoms with —OH (alcohol) functional group. IUPAC name: **Propan-1-ol** (b) **CH₃CH₂Br** — It has 2 carbon atoms with bromo substituent. IUPAC name: **Bromoethane** (c) **CH₃COCH₂CH₃** — It has 4 carbon atoms with ketone (—CO—) functional group. IUPAC name: **Butan-2-one** **(ii)** Compound **(c) CH₃COCH₂CH₃** belongs to the **ketone** functional group. The ketone group (>C=O) is present between carbon atoms, and its IUPAC suffix is **-one**. *Source: Chapter 4, Section 4.2.5 Nomenclature of Carbon Compounds* --- ## Explanation - For alcohols, suffix **-ol** is added; for haloalkanes, the halogen name is used as a **prefix** (bromo, chloro). - For ketones, suffix **-one** is used. The position of the functional group must be indicated (butan-**2**-one). - Examiners expect correct spelling and position numbers. "Propan-1-ol" is preferred over just "propanol" to show the position.

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