NMR

Which mass number of nuclei are NMR active ?

• Odd

• Even

• A&B

• None

If the external magnetic field is a applied , the number of possible orientation is calculated by

• 2I +2

• 2I + 3

• 2I +1

• 2I +4

The ratio between the nuclear magnetic moment and angular moment is called

• Magneto gyric ratio

• Precessional movement

• Gyromateric ratio

• All of the above

In NMR spectrum the nuclei in up field resonate at

• High frequency

• Low frequency

• It is constant throughout the spectrum

• It doesn’t depends on chemical shift

The possible number of peaks in 1H NMR spectrum of the following structure is

• 1

• 2

• 3

• 4

Which of the following solvent is not used in NMR?

• D ₂O

• CHCl ₃

• CCl ₄

• CDCl ₃

In proton NMR spectroscopy, hydrogen bonding results in

• Shielding effect

• Deshielding effect

• Peak splitting

• All of the above

Given below is a dihalo alkane. Select the number of signals that will be produced by the compound in 1H NMR.

• 1

• 2

• 4

• 5

Which of the following environmental effect is influenced by magnetic field strength

• Chemical shift

• Spin splitting

• Both are influenced

• Both are not influenced

Compound A has greater shielding constant than compound B. Which of them will have more chemical shift?

• Compound A

• Compound B

• Both will have equal chemical shifts

• Chemical shift has no relation with shielding constants