MCQ on spectroscopic techniques

What is Spectroscope | Spectroscope | How to read a spectroscope

स्पेक्ट्रोस्कोप | What is Spectroscope in Hindi

Chromatography | Chromatograph

Gas chromatography

Paper chromatography

Thin layer chromatography

क्रोमैटोग्राफी | Chromatography in Hindi

गैस क्रोमैटोग्राफी | Gas chromatography (GC) in Hindi

पेपर क्रोमैटोग्राफी | Paper chromatography in Hindi

थिन लेयर क्रोमैटोग्राफी | TLC in Hindi

NMR spectroscopy is useful for determining the type and number of _______ atoms in organic molecules.

(a) hydrogen

(b) carbon

(c) halogen

(d) hetero atoms

Correct Answer

What is the multiplicity of the methylene hydrogens of a carbon that is attached to a methyl group and to a methyl group and to a methoxy group?

(a) doublet

(b) singlet

(c) quartet

(d) triplet

Correct Answer

Each of the following compounds has a singlet in its 1H NMR spectrum. Which compound would have its singlet at the highest frequency?

(a) 1-bromo-2,2-dimethylpropane

(b) ethyl methyl ether

(c) ethyl-tert-butyl ether

(d) 1,2-dibromoethane

Correct Answer

Which of the following compounds would have the signal for its methylene hydrogens farthest downfield?

(a) ethyl chloride

(b) ethyl iodide

(c) ethyl bromide

(d) ethyl fluoride

Correct Answer

How many signals would you expect to see in the 1H NMR spectrum of chlorocyclobutane?

(a) 1

(b) 3

(c) 4

(d) 5

Correct Answer

What is the multiplicity of the OH group of an alcohol in a solution that contains a trace amount of acid?

(a) doublet

(b) quintet

(c) quartet

(d) singlet

Correct Answer

How many signals would you expect to see in the 1H NMR spectrum of butane?

(a) 1

(b) 2

(c) 3

(d) 4

Correct Answer

Which of the following will occur farthest downfield?

(a) the hydrogens of benzene

(b) the hydrogens of ethyne

(c) the hydrogens of dimethyl ether

(d) the hydrogens of H COH

Correct Answer

How many signals will vinyl chloride have in 1H NMR spectrum?

(a) 1

(b) 2

(c) 3

(d) 4

Correct Answer

How many signals does 2,2,4-trimethylpentane have in its 1H NMR spectrum?

(a) 2

(b) 3

(c) 4

(d) 5

Correct Answer

How many signals would you expect to see in the 1H NMR spectrum of 2-methylpropene?

(a) 2

(b) 3

(c) 4

(d) 5

Correct Answer

Which of the following compounds is frequently used as an internal reference in 1H NMR spectroscopy?

(a) TNS

(b) DMF

(c) TMS

(d) DMSO

Correct Answer

Which of the following describes the 1H NMR spectrum of 1,2-dichloroethane?

(a) one doublet

(b) two triplets

(c) two doublets

(d) one singlet

Correct Answer

What is the multiplicity of the CH2, hydrogens in CH3OCH2CH2OCH3?

(a) a singlet

(b) a triplet

(c) a quartet

(d) a doublet

Correct Answer

What would be the splitting of the protons on the CH2 groups of butane?

(a) doublet

(b) sextet

(c) triplet

(d) singlet

Correct Answer

Only one signal is present in the PMR spectra of

(a) C₂H4, C3H6

(b) C₂H6, C5H12

(c) C8H18,C2H6

(d) All

Correct Answer

A proton Hb is coupled to four equivalent protons Ha.The  multiplicity and relative  intensity of lines in the signal Hb is

(a) Doublet, 1: 4:9.

(b) Triplet 1: 4: 6

(c) Quintet, 1: 4: 6: 4: 1

(d) Quartet 1: 4: 6: 4:4.

Correct Answer

 The compounds showing only a single peak in its PMR spectrum are: Acetone (I), Ether (II), Methyl acetate (III), Dibromoethane (IV), Chlorobromoethane (V). 

(a) I, II, IV

(b) II, III, V

(c) I, III, V

(d) III, IV, V

Correct Answer

The aldehydic proton appears much downfield in the PMR because the aldehydic proton is

(a)  Strongly shielded

(b) It lies in the deshielding zone of the carbonyl group

(c) It occurs at 10 8 ppm

(d) All

Correct Answer

The actual value of nuclear spin depends on

(a) Mass number

(b) Atomic number

(c) Both a and b

(d) Shielding effect

Correct Answer

The different types of energies associated with a molecule are __________
a) Electronic energy
b) Vibrational energy
c) Rotational energy
d) All of the mentioned

Correct Answer


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