B.Sc.III

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B.Sc.III

E-Test Organic Chemistry

The frequency characteristic to terminal alkynes……………

2 points

3080 cm-1

1700 cm-1

3300 cm-1

2700 cm-1

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How many nonequivalent proton are present on CH3-CH2-OH this structure

2 points

None of these

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Formula of Calculating number of fundamentals modes of vibrations for anon-linear molecule……..

2 points

3N-5

3N-6

Any of theses

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When a parallelly aligned proton absorb radio frequency radiation it undergoes………..

2 points

Flipping

Resonance

Change in precessional frequency

None of these

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A typical example Chromophore is ……….

2 points

Carbonyl

Hydroxide

Amine

Chloride

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The δ value of methyl protons in ………………..is maximum.

2 points

CH3.Cl

CH3.R

CH3.Br

CH3.F

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λ max value of CH3-CH=CH-CH=CH-CH3this compound is …………..

2 points

224

214

205

253

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According to Hooks law, the vibrational frequency is proportional to …………

2 points

Square root of force constant

Under root of ratio of force constant and reduced mass

root of reduced mass

both a and c

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The electromagnetic radiation having wavelength of 400-750 nm is called as………..

2 points

Light

Infra red rays

Radio waves

Gamma rays

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The chemical shift value assigned to TMS proton is……………

2 points

δ = 0

δ = 10

τ = 10

both a and c

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The highest energy photons are found in the radiations of type…………

2 points

Radio wave

Gamma rays

Infra red rays

Visible rays

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Mobile Number *

IR-absorption occurs only when there is change in ……….

2 points

Bond length

Bond angle

Bond strength

Bond polarity

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The universally accepted reference for proton in non-aqueous solvents is…..

2 points

Tetra methyl silane

Methyl chloride

Benzene

Ethyl alcohol

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The pmr-spectrum of ……………compound carries more than one peak.

2 points

CH3.CO.CH3

(CH3)2CCl2

HCHO

CH4O

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An example of auxochrome is……..

2 points

Alkene

Carbonyl

Amine

All of these

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The ratio signifying a quartet is………..

2 points

1:1:1:1

2:1:2:1

2:1:1:2

1:3:3:1

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What is the ultra-violet region?

2 points

400-800 nm

100-200 nm

200-800 nm

200-400 nm

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Frequency is Inversely proportional to ……………

2 points

Wave number

Planks constant

Amplitude

Wavelength

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Finger print region of IR-spectrum lies in the range of …………..

2 points

4000-650 cm 1

4000-1350 cm 1

400-750 cm 1

1350-650 cm 1

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The source used for UV radiation.

2 points

Sodium Lamp

Deuterium discharge Lamp

Nernst Glower

Tungsten filament

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Hydrogen bonding causes the IR-absorption band to be ………..

2 points

Broader

Sharper

Weaker

Shoulder

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The nmr phenomenon cannot be shown by ………….nuclei.

2 points

1H1

5B10

6C12

7N15

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The energy carried by photon is equal to .......

2 points

hC/λ

hυ

hῡυ

all of these

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According to Beer Lamberts law absorbance(A) of the solution is……

2 points

Directly proportional to wavelength

Indirectly proportional to concentration of solution

Directly proportional to concentration of solution

Directly proportional to transmitted light

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The stretching frequency of >C=C< chromophore is …………..than that of C-C

2 points

Less

Half

Equal

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