confirmations of higher alkane Flashcards

1
Q

In general, the all-anti conformer

A

is most stable

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2
Q

conformers with zig-zag appearances are called

A

zig-zags

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3
Q

The most stable cycloalkanes should have bond angles
near

A

109.5º

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4
Q

cyclopentane(108 degrees) vs cyclohexane(120 degrees), which is more stable?

A

cyclohexane

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5
Q

cyclopropane has a bond angle of

A

60

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6
Q

cyclobutane has a bond angle of

A

90

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7
Q

cyclopentane has a bond angle of

A

108

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8
Q

cyclohexane has a bond angloe of

A

120

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9
Q

cycloheptane has a bond angle of

A

70 degrees

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10
Q

how do we measure stability

A

stability using enthalpies of combustion

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11
Q

Heat per CH2
combusted is smallest for

A

cyclohexane

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12
Q

cyclopropane is characterized by extremely severe

A

angle strain—its internal C–C–C bond angle is only 60º

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13
Q

C–C bonds in cyclopropane are ______ and derived from the bond angled overlap of ______hybrids

A

-bent
-sp3

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14
Q

Internal C–C bonds are ____and_____ to break

A

weak
liable

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15
Q

Cyclopropane also suffers from _____due to ____

A

torsional strain
-eclipsing C-H’s

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16
Q

which angle strain is worse cyclobutane or cyclopropane

A

Angle strain in cyclobutane is not quite as bad as cyclopropane (90º versus 60º)

17
Q

How does the cyclobutane ring minimize torsional or eclipsing strain?

A

It puckers