Quiz - Alkynes | Alkynes
The triple bond of an alkyne is made up of:
3 σ bonds
2 σ bonds + 1 π bond
1 σ bond + 2 π bonds
3 π bonds
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?
0
1
2
3
Which of the following reagents should be used to convert but-2-yne to (E)-but-2-ene?
H2, Pt
H2, Lindlar catalyst
Na, NH3 (liq.)
HgSO4, H2O
Which of the following reagents should be used to convert but-2-yne to (Z)-but-2-ene?
H2, Pt
H2, Lindlar catalyst
Na, NH3 (liq.)
HgSO4, H2O
Which of the species below is less basic than acetylide?
nBuLi
MeMgBr
MeONa
All of the above
nBuLi (pKa ~ 50) = MeMgBr (pKa ~ 50) > Alkynes (pKa = 25) > MeONa (pKa = 15-16)
Which of the alkyne addition reactions below involves an enol intermediate?
Addition of hydrogen halide
Hydroboration - Oxidation
Hydration with HgSO4
None of the above
