Question

Analyze the proton and carbon NMR of hexane

PROTON_01 4632-2_Hexane -109 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0

Answer 1

Solution:

PROTON_01 4632-2_Hexane There are three type of protons in hexane as hexane is symmetric structure. 'a" type protons: Two -CH3 groups are showing triplete at 0.8-0.9 ppm for six protons. _'b" and "c" types of protons: All -CH2 were observed as a multiplate at 1.2-1.4 ppm for eight protons. deally "b" and "c" types protons should have appeared separate peak but observed as a bunch of multiplate. b c a а C b 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 fi (ppm) 3.0 2.5 2.0 1.5 1.0 0.5 0.0

CARBON_01 4632-2_Hexane There are three type of carbons in hexane as it is symmetric structure. "a" type carbons: TWO -CH3 groups are showing singlet at 12 ppm for two carbons. "b" types of carbons: TWO -CH2 groups attached to -CH3 groups are showing singlet at 21 ppm for two carbons. -CH2 -CH2-CH3 "c" types of carbons: TWO -CH2 groups attached to -CH2 groups are showing singlet at 32 ppm for two carbons due to minimized shielding effect of CH3 group. c ba All signals were observed in same intensity because of same carbon numbers (two carbon) for each signal. a b ca сь Carbon "a" : 12 ppm Carbon "b":21 ppm Carbon "c" : 32 ppm muy inter netu wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwpinaliwatum w wwwwwwwwwwwwwwwwwwwwwwwww w www 230 220 210 200 190 180 170 160 150 140 130 120 110 fi (ppm) 100 90 80 70 60 50 40 30 20 10 0 -10

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