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a
3-ethyl-4,4-dimethyheptane
b
4,4-dimethyl-3-ethylheptane
c
5-ethyl-4,4-dimethylheptane
d
4,4-bis(methyl)-3-ethylheptane
answer is A.
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Detailed Solution
The structure isCH3CH2CH2C(CH3)2CH(C2H5)CH2CH3While writing IUPAC name,alkyl groups are written in alphabetical priority, lower locant 3 is assigned to ethyl