I need help on natural science workshop B

[busdent]

Can somebody explain me why the answer for 75 is A? Sorry I can't draw it out here.

also question 90,

which of the following compounds would have a doublet in its NMR spectrum?

a. acetone
b. propane
c. isobutane
d. acetic acid
e. ethyl alcohol

I don't understand kaplan's reasoning.

thanks

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[Dr. juju]

Can somebody explain me why the answer for 75 is A? Sorry I can't draw it out here.

also question 90,

which of the following compounds would have a doublet in its NMR spectrum?

a. acetone
b. propane
c. isobutane
d. acetic acid
e. ethyl alcohol

I don't understand kaplan's reasoning.

thanks

for 75, it's because oxygen is more electron donating than carbon (due to 2 nonbonded pairs). Basically chain activating groups are electron donating which result in increase of basicity.

for 90, I have to review splitting myself
can someone else help?