Astudent incorrectly names an organic hydrocarbon 4-butyl-2,3-dimethylpentane. what is the correct name for this substance? 1. 2,3,4-trimethyloctane 2. 2,3-dimethylnonane 3. 1,1,2,2-tetramethylpentane 4. 2-isopropyl-3-methylheptene 5. 5,6-dimethyl-6-isopropylhexane 6. 5,6-dimethylpentane

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a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o