Which of the following is the correct IUPAC name ?

1.	Which of the following is the correct IUPAC name ?
Answer» 3-ethyl-4, 4-dimethylheptane 4, 4-dimethyl-3-ethylheptane 5-ethyl-4, 4-dimethylheptane 4, 4-bis(methyl)-3-ethylheptane Solution :`OVERSET(7)(C )H_(3)- overset(6)(C )H_(2)- overset(5)(C )H_(2) - underset(underset(CH_(3))(\|))overset(overset(CH_(3))(4\|))(C )- overset(overset(C_(2)H_(5))(3\|))(C )H- overset(2)(C )H_(2) - overset(1)(C )H_(3)` According to alphabetical order methyl is written after ethyl. To write prefixes di of two `-CH_(3)`

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