How do you select the longest parent chain when naming alkenes? correct answers The one that contains the double bond
How do you number the longest parent chain when naming alkenes? correct answers Number so as to include both carbon atoms of the double bond and begin numbering at the end of the...
CHE 310 Exam #3 || very Flawless.
How do you select the longest parent chain when naming alkenes? correct answers The one that
contains the double bond
How do you number the longest parent chain when naming alkenes? correct answers Number so
as to include both carbon atoms of the double bond and begin numbering at the end of the chain
nearer the double bond
How do you designate the location of the double bond? correct answers Use the number of the
first atom of the double bond as immediately before the suffix
How do you number substituted cycloalkenes? correct answers The way that gives the carbon
atoms of the double bond the 1 and 2 positions and that also gives the sub groups the lower
numbers at the first point of difference
Vinyl group correct answers
Allyl group correct answers
When do you use cis and trans for alkenes? correct answers For disubstituted alkenes where each
C of the double bond has one sub
When do you use (E)/(Z) naming system? correct answers For trisubstituted alkenes where each
C of the double bond has more than one sub
How do you use (E)/(Z) naming system? correct answers Through the Cahn-Ingold-Prelog
highest priority system (based on molecular weights)
What is the Z designation similar to? correct answers Cis
What is the E designation similar to? correct answers Trans
How do you designate a compound as cis? correct answers If two identical or substantial groups
are on the same side of the double bond
How many carbon atoms of cycloalkene rings exist only in the cis form? correct answers 8 or
fewer; due to greater strain if trans were included due to the bonds of the ring atoms not being
able to accommodate that
Why do alkynes not have cis/trans or (E)/(Z) nomenclature? correct answers They are sp
hybridized with a linear geometry
Why are cis isomers of alkenes more unstable than trans isomers of alkenes? correct answers
Strain caused by crowding of two alkyl groups on the same side of a double bond
, What attributes to overall alkene stability? correct answers The number of alkyl groups attached
to the carbon atoms of the double bonds; 3 subs are more stable than none/one
What measurement can relate to alkene stability? correct answers Heats of hydrogenation
How do you name bicyclic aklenes? correct answers Using Bredt's rule: a bridgehead C can be
involved in an alkene only if any one of the rings is greater than or equal to 8 carbons (enough
flexibility in size to accomodate 3 rings)
How do the numbers of alkyl groups attribute to alkene stability? correct answers Electron-
releasing effect of alkyl groups that satisfies the electron-withdrawing properties of the sp2-
hybridized carbon atoms of the double bond
How do you designate a compound as trans? correct answers If two identical or substantial
groups are on opposite sides of the double bond
What shape and bond angle to alkenes have? correct answers sp2 hybridized (trigonal planar)
with 120 degrees bond angle
Why do alkenes not have dimensionality? correct answers All atoms are in the same plane due to
the double bond
Why is a pi bond a unit of unsaturation? correct answers The carbons associated with it are not
completely saturated with hydrogen atoms
What is the most important means of creating alkenes? correct answers Elimination reactions
What elimination reaction are alkyl halides involved in? correct answers Dehydrohalogenations
What elimination reaction are alcohols involved in? correct answers Dehydrations
What type of bases are used for dehydrohalogenations? correct answers Strong bases that are
either small or bulky
What constitutes a strong base? correct answers Ones that have a negative charge and attached to
some type of metal
What constitutes a small base? correct answers Hydroxides (alkoxides)
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