OC 2 exam 1 2026

How many chiral carbons are in the following molecule?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-2

Label the chiral center in the following molecule as R or S

• R

• S

Tags

NGSS.HS-LS1-6

Label the chiral center in the following molecule as R or S

• R

• S

Why is the expected stretching absorption of the C=O bond 1685  for the structure I and 1715  for structure II?

• Compound II has a C to O double bond with considerable single bond character, lowering the expected stretching absorption.

• The expected stretching absorption is lowered in all molecules with cyclohexane rings.

•  Having fewer double bonds results in lowering of all of the stretching absorptions.

• The C to O double bond of compound I has greater single bond character than the C to O double bond of compound II.

Which of the given compounds shows two absorptions, one at 2700  and one at 2800 , in addition to the carbonyl absorption?

• I

• II

• III

• IV

Tags

NGSS.HS-PS4-3

A compound with molecular formula , shows absorptions at 2500-3300  (broad), 1720  and at 1200  on the IR spectrum. Choose a possible structure(s) for this compound.

• I and III

• I

• II

• III and II

Tags

NGSS.HS-PS1-2

________ protons experience a net magnetic field strength that is smaller than the applied magnetic field.

• Shielded

• Deshieled

• Heavy

• Paramagnetic

How many signals would you expect in theH NMR spectrum of CH₃OCH₂CH₃?

• 1

• 2

• 3

• 4

True or false: this would be the correct expected splitting pattern for a 1H NMR of the molecule shown.

• True

• False

True or False: this would be the correct splitting pattern on 1H NMR of the molecule shown.

• True

• False