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Orgo 2 > IR > Flashcards

IR Flashcards

1
Q

T/F: ER has properties of waves and particles

A

T

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2
Q

Relationship btwn wavelength and freq

A

inverse. c=wavelength(freq)

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3
Q

Relationship btwn energy of photon and freq

A

proportional. E=hv

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4
Q

IR gives info abt…

A

IR

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5
Q

NMR gives info abt…

A

chemical env/connectivity

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6
Q

T/F: energy exists as a continuum

A

F, delta E is quantize

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7
Q

Which has a larger delta E, C-H or C-O?

A

C-H

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8
Q

relationship btwn wavenumber and force constant (bond strength)

A

proportional

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9
Q

relationship btwn wavenumber and mass

A

inverse

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10
Q

what factors affect wavenumber

A

mass, resonance, hybridization, bond strength

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11
Q

effect of mass on wavenumber

A

smaller = higher wavenumber

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12
Q

effect of bond strength on wavenumber

A

the stronger the bond = higher wavenumber

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13
Q

order for wavenumber

A

X-H > triple>double>single

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14
Q

effect of hybridization on wavenumber

A

sp = highest wavenumber

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15
Q

ring strain inc bond strength of C=O on a ring

A

non-integer hybridization

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16
Q

effect on resonance on wavenumber

A

more resonance = lower wavenumber

17
Q

factors impacting signal intensity

A

bond polarity, number of identical bonds

18
Q

effect of bond polarity on intensity

A

the more polar, the more intense

19
Q

effect of number of bonds at that freq

A

the more bonds, the more intense

20
Q

T/F: symmetrical molecules show up on an IR

A

F; symmetry is IR silent

21
Q

T/F: IMF can’t change bond strength

A

F; hydrogen bonding makes a broader signal bc it weakens the bond (OH and NHs)

22
Q

how many signals do secondary amines have

A

1

23
Q

how many signals do primary amines have

A

2

24
Q

why do primary amines have 2 signals?

A

NH2 has 2 stretching modes

25
Q

what does mass spec useful for

A

determining molecular weight of molecule

26
Q

how is mass spec done?

A

using a high-energy electron to strike a vaporized molecule, energy-rich molecule ejects an electron and is now a radical cation which gets detected

27
Q

T/F: the larger the mass, the more it gets deflected

A

F

28
Q

T/F: bp can sometimes be molecular ion peak

A

T

29
Q

Br on mass spec

A

M+. and (M+2)+. are 1:1 in height

30
Q

Cl on mass spec

A

M+. and (M+2)+. are 3:1 in height

31
Q

weight of benzene

A

78

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