4. Which of the following statements about deshiel A) The about deshielded mucle

Question

4. Which of the following statements about deshiel A) The about deshielded muclei is lals nucleus to required for the nucleus to achieve resonance experi spin-fliphmucleus, the more energy that is required to cause the a nucleus, the higher the frequency radio waves that are d nucleus, the higher the magnetic field strength (Bo) C) The more deshielded a by the nueleus. E) Theo deshielded a nucleus, the more upfield its signal eppcsnearby stom. ed tho density is withdrawn away toward a nearby stom more a nucleus's electron 5 downfield? , In the 'H-NM k of the following molecule, which 'H atom's signal appears mort iadicates Only the 'H atoms giving rise to the signal of interest have been drawn in the structure 6. In the 'H-NMR spectrum of the following molecule, the signal coresponding to the H atoms would be a ) triplet that integrates tos B singlet that integrates to 2 C) doublet that integrates to 3 D) triplet that integrates to2 E) quartet that integrates to

Explanation / Answer

Solution :-

Q4) The statement which is false regarding deshielding is statement D

Because more deshielding means the signal appear at downfield (higher ppm ) values while more shielding means signal appear at upfield value (Lower ppm)

Q5) In the given structure the proton shown by letter E is the most downfield proton because the carbonyl group of the aldehyde is electrophilic which causes the deshielding of the aldehyde proton therefore it gives downfield value. The approximate value of the aldehyde proton is 9 -9.5 ppm which is lowest in the given structure.

Hence its proton shown by letter E.

Q6) The CH3- group marked in the structure is attached to the CHF-CH3 group

So the according to the n+1 rule

The CH3 protons have 1 adjacent proton therefore n=1

Hence n+1 gives

1+1 = 2 doublet.

So it gives doublet for the 3 hydrogens

Hence correct answer is option C

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