O Chem Test 2

Question 1

Alkene

Answer 1

hc with at least 1 dbl bond

Question 2

Alkyne

Answer 2

hc with at least 1 triple bond

Question 3

enyne

Answer 3

hc with at least 1 dbl and 1 triple bond

Question 4

olefins

Answer 4

alternative name for alkenes

Question 5

acetylenes

Answer 5

alternative name for alkynes

Question 6

CnHzn

Answer 6

general formula for acyclic alkenes

Question 7

CnH2n-2

Answer 7

general formula for acyclic alkynes

Question 8

cumulated alkenes

Answer 8

alkenes w/ adjacent dbl bonds at least once in the molecule

Question 9

conjugated alkenes

Answer 9

alkene in which 2 dbl bonds are separated by a singlel carbon bond

Question 10

isolated alkene/alkyne

Answer 10

alkene/alkyne w/2 or more sets of multiple bonds separated by more than 2 single carbon bonds

Question 11

structural isomerism

Answer 11

isomerism as defined previously, isomers= molecules with same chemical formula but different structural formulas

Question 12

spatial isomers

Answer 12

isomer w/ the same structural formula, but with diff arrangement of the atoms in space

Question 13

cis/trans isomerism in cycloalkanes

Answer 13

a kind of spatial isomerism involving the placement of side groups on either side of a ring

Question 14

steric hindrance

Answer 14

lack of freedom of side groups to move to either side of a ring due to adjacent atoms w/ their electron clouds filling up the surrounding space

Question 15

configurational isomers

Answer 15

spatial isomers that are truly different molecules w/no spontaneous inter-conversion possible between them

Question 16

cis/trans isomerism in alkenes

Answer 16

a type of spatial isomerism involving the placement of side groups on either side of multiple bond

Question 17

conformations (conformers)

Answer 17

spatial isomers which fairly easily interconvert at normal conditions

Question 18

eclipsed conformation

Answer 18

conformation w/branch atoms/groups along the same line of sight

Question 19

staggered conformation

Answer 19

conformation w/branch atoms/groups

Question 20

molecular projection

Answer 20

an attempt to show on 2-D paper the 3-D spatial structure of a molecule

Question 21

chair conformation

Answer 21

conformation of cyclohexane in which all carbon bond angles =109.5

Question 22

puckered conformation

Answer 22

a conformation in which a molecular ring is warped or bent to accommodate a certain bond angle

Question 23

boat conformation

Answer 23

a pcukered conformation for cyclohexane in which all c-c bonds are at 109.5 but less stable than chair confromation

Question 24

equatorial bonds

Answer 24

bonds of H’s or substituents in the average plane of the ring

Question 25

axial bonds

Answer 25

bonds of H's or substituents parallel to the average plane of the ring