Expert Help with Mass Spectroscopy Homework: IR & NMR Analysis for Molecule B

[joe98]

Homework Statement

Spec diagrams are attached, could someone see if i am correct so far with these questions

1)Which types of bonds can be identified in the IR spectrum of molecule B? carbonyl group i believe

2) By identifying the molecular ion, determine which of the molecular formula is consistent with the mass spectrum of B. C2H4O i believe


3)How many hydrogen environments are there in molecule B? 2 signals so 2 peaks

4)The peak at 2.7 ppm in the 1H NMR spectrum of B is most likely to be:

5)Identify molecule B ? not sure guys

can someonehelp in q4 and 5

cheers

 

[joe98]

These are the actual questions i have posted my solution on the above post,
any suggestions chhers,

Question 1

Which types of bonds can be identified in the IR spectrum of molecule B?
Answer

a. C=O and C=C

b. C=O and O-H

c. O-H only

d. C=O only

Question 2

By identifying the molecular ion, determine which of the molecular formula is consistent with the mass spectrum of B.
Answer

a. C4H8O2

b. C2H3O

c. C2H4O

d. C4H6O

Question 3

How many hydrogen environments are there in molecule B?
Answer

a. 8

b. 3

c. 7

d. 4

Question 4

The peak at 2.7 ppm in the 1H NMR spectrum of B is most likely to be:
Answer

a. alkyl group hydrogen



b. aldehyde proton



c. proton adjacent to a carbonyl



d. proton adjacent to an oxygen



Question 5

The peak at 1.1 ppm in the 1H NMR of molecule B is a doublet. It represents protons adjacent to:
Answer

a. CH

b. CH2

c. CH3

d. quaternary carbon

Question 6

Identify molecule B from the selection below?

 

[joe98]

my answers are so far d, c, c, b ,b
not sure for q6