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CHE 310 Exam #3 || very Flawless.
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  • CHE 310

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...

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  • October 31, 2024
  • 8
  • 2024/2025
  • Exam (elaborations)
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  • how do you select the longest parent chain when na

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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

Acetylene correct answers

Terminal alkynes correct answers monosubstituted acetylenes

Acetylenic hydrogen atom correct answers

Alkynide ion correct answers

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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