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When naming a chain bearing -CHO or -COOH, which carbon is assigned the number 1?
AThe carbon of the functional group
BThe carbon farthest from the group
CAny terminal carbon chosen freely
DThe carbon at the centre of the chain
Answer & Solution
Correct answer: A. The carbon of the functional group
1. Numbering should give the functional group the smallest possible number.
2. For -CHO or -COOH the rule fixes the functional-group carbon as number 1.
3. So numbering starts at the carbon carrying that group.
4. Rule out B: starting from the far end gives the group a larger number, which is not accepted.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 9 "Carbon Compounds", p.130_
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