Quiz - Alkynes - 1 | Alkynes
Organic Chemistry 2 - Quiz - Alkynes - 1
The triple bond of an alkyne is made up of:
C ≡ C bond of alkynes:
1 σ bond ⇒ formed from 2 sp orbitals of carbon atoms
2 π bonds ⇒ formed from 4 p orbitals of carbon atoms
How many distinct alkynes are there with a molecular formula of C4H6?
Which of the following reagents should be used to convert but-2-yne to (E)-but-2-ene?
Which of the following reagents should be used to convert but-2-yne to (Z)-but-2-ene?
Which of the species below is less basic than acetylide?
nBuLi (pKa ~ 50) = MeMgBr (pKa ~ 50) > Alkynes (pKa = 25) > MeONa (pKa = 15-16)
Which of the alkyne addition reactions below involves an enol intermediate?
For the electrophilic addition of HBr to an alkyne, which of the following describes the regioselectivity?
In the addition of HBr to an alkyne, Markovnikov's rule applies, leading to the bromine adding to the more substituted carbon atom due to the stability of the resulting carbocation intermediate.
Which of the following methods is used for the preparation of alkynes through the elimination of two molecules of HX from a dihaloalkane?
Dehydrohalogenation is the elimination of hydrogen halides (HX) from dihaloalkanes to form alkynes. This usually follows an E2 mechanism and may require a strong base.