Organic Chemistry: Alkyne

A triple bond is comprised of three separate bonds: one .......... bond and two ........... bonds.

• single bond and double bond

• single bond and triple bond

• double bond and triple bond

• sigma bond and phi bond

• phi bond and sigma bond

Provide a systematic name for the following compound:

• 2-methyl-2-pentyne

• 2-methyl-3-heptyne

• 3-hexyne

• 2-methyl-3-hexyne

• 2-pentyne

Draw a bond-line structure for 4,4-dimethyl-2-pentyne.

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Citronellal is the main compound responsible for the lemon scent of citronella oil. In addition to its well-known insect repellant properties, it also has some antifungal properties. (+)-Citronellal also has been used1 as a starting material to make compound 1. Provide an IUPAC name for compound 1.

• 2,5-dimethyl-1-heptyne

• 3,7-dimethyl-1-octyne

• 2,4-Dimethyl-2-octyne

• 3,6-methyl-1-heptyne

• 1,5-dimethyl-2-nonyne

Predict the major product(s) expected for the following reactions (xs = excess):

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Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

When alkynes are treated with hot KMnO4, a triple bond is completely broken forming carboxylic acids and aldehydes depending upon the structure of alkyne.

• True

• False

 

In an alkyne reaction with HX, addition of excess HX acid yields to a vinyl halide.

• True

• False

HX addition of alkynes also follows the Markovnikov's Rule which states that hydrogen adds to the carbon with the most number of hydrogen attached to it.

• True

• False

Ozonolysis of internal alkynes yields to a carboxylic acid.

• True

• False

Lindlar's catalyst, prepared by deactivating (or poisoning) a conventional palladium catalyst by treating it with lead acetate and quinoline, permits alkynes to be converted to alkenes without further reduction to an alkane, hence forms a trans-alkene.

• True

• False