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MCQ on NMR spectroscopy: Page-11

Which of the following has more chemical shift

(A) CH3F

(B) CH3Cl

(C) CH3Br

(D) CH3I

Which of the following statement is CORRECT

(A) More the electro negativity lesser the chemical shift

(B) More the electro negativity more the chemical shift

(C) More the size of the atom lesser the chemical shift

(D) More the size of the atom more the chemical shift

For aqueous samples, the useful standard in NMR is

(A) Tetramethyl silane

(B) Dimethylchloro silane

(C) Dimethyl silapentane sulfonate sodium

(D) Squalene

Spin-spin coupling may be absent in

(A) Pure samples

(B) Chemical exchange

(C) Tertiary hydrogens

(D) None

Isotopes are mainly detected by

(A) Low field NMR

(B) High resolution NMR

(C) Not by NMR

(C) None of the above