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WorksheetsAlkynes and Benzene
Total questions: 10
Worksheet time: 6mins
Which among the following product is formed when ethyne undergoes hydration?
Formaldehyde
Formic acid
Acetaldehyde
Acetic acid
Select the incorrect statement regarding terminal alkynes.
1-propyne is an example of terminal alkynes
Terminal alkynes are more acidic when compared with alkenes
Terminal alkynes are not as acidic as alkanes
These have a replaceable acidic hydrogen atom
1-butyne and 2-butyne can be identified by using which of the following reagents?
O2
Br2
NaNH2
HCl
In the ozonolysis reaction, acetylene forms
Formaldehyde
Glycol
Formic acid
None of the above
What would the product of the reaction of 1-butene with bromine be?
2-bromobutane
1-bromobutane
2,3-dibromobutane
1,2-dibromobutane
What is the IUPAC name for this compound?
1-fluoro-1,1,4,4-tetramethyl-2-butyne
2-fluoro-2,5,5-trimethyl-3-pentyne
5-fluoro-1,1,5-trimethyl-2-pentyne
2-fluoro-2,5-dimethyl-3-hexyne
What are the relationships between double and single bonds?
Double bonds are longer, and therefore, stronger than single bonds.
Double bonds are longer, and therefore, weaker than single bonds.
Double bonds are shorter, and therefore, stronger than single bonds.
Double bonds are shorter, and therefore, weaker than single bonds.
a) What catalyst is needed for hydrogenation?
b) What is needed for halogenation?
a) Pt, Pd or Ni
b) UV light
a) H+
b) Heat
a) [O]
b) Heat
a) [-O]
b) H+
Resonance in benzene is stabilized due to
strong covalent bond
strong pi bond
delocalization of pi electrons
delocalization of sigma electrons
What did Kekulé suggest as a structure for benzene?
A 3D cage of carbons with a complex system of bonds between them, with one hydrogen attached to each carbon
A ring of six carbon atoms with a stable, delocalised system of s-electrons forming bonds between the carbons and the single hydrogen atom bonded to each carbon
A long, long chain of carbons and hydrogens with alternating single and double bonds between the carbons
A ring of six carbons with alternating single and double bonds between the carbons, with one hydrogen atom bonded to each carbon
