Organic Chemistry Answers

Question 16 : A benzene ring is a ________ system.
None
Conjugation
Hyperconjugation
non conjugation

Question 17 : Another name for methyl benzene is __________.
Phenol
Toluene
Xylene
Naphthalene

Question 18 : 2-methylpropane will have ________than butane.
lower due point
lower saturation point
lower boiling point
lower melting point

Question 19 : Chlorination of ethene at high temperature yields ---------.
Chloroethene
Chloroethyne
12-dichloroethene
13-dichloroethene

Question 20 : All these are electron donating groups with respect to reactivity and orientation EXCEPT _______

−
C
N
−CN


−
N
H
C
O
R
−NHCOR


−
O
R
−OR


−
O
H
−OH

Question 11 : In electrophilic addition to alkenes, the electrophilic attack is on ---------.
C-H bond
None of the above
C=C bond
H-H bond

Question 12 : A benzenoid hydrocarbon in which two benzene rings are fused together at the ortho position is called ----------. <
Naphthalene
Biphenyl
Anthracene
Phenanthrene

Question 13 : A substance which ionises to produce hydroxide ions is called __________.
Salt
Base
None of the above
Acid

Question 14 : Hydrogenation of benzene at higher temperature and under pressure yields -------
Benzaldehyde
Cyclohexyne
Cyclohexene
Cyclohexane

Question 15 : Among isomeric molecules, the linear isomer is ________.
Polar isomer
non-polar isomer
Unbranched isomer
Branched isomer

Question 1 : _______is an example of Isolated Benzenoid Hydrocarbon.
Phenanthrene
Anthracene
Biphenyl
Naphthalene

Question 2 : Down the group, electronegativity ------------------.
None of the above
Increases
Decreases
Neutral

Question 3 : A compound in which a halogen atom is attached to another carbon atom by a double bond is called -----.
Vinyl halide
Alkyl halide
Vicinal dihalides
Geminal dihalides

Question 4 : All these affect boiling points except __________.
Polarity
Shape of molecule
Molecular structure
London forces

Question 5 : Geometric isomerism yields __________isomers
Four
Two
Three
Five

Question 16 : All these are electron donating groups with respect to reactivity and orientation EXCEPT _______

−OR


−CN


−OH


−NHCOR


Question 17 : Another name for methyl benzene is __________.
Naphthalene
Toluene
Xylene
Phenol

Question 18 : Chlorination of ethene at high temperature yields ---------.
Chloroethyne
13-dichloroethene
Chloroethene
12-dichloroethene

Question 19 : 2-methylpropane will have ________than butane.
lower saturation point
lower boiling point
lower melting point
lower due point

Question 20 : In the hydrogenation of benzene,the condition for reaction is ______.
Ni 525-625K 25atm
Ni 425-525K 25atm
Fe 425-525K 25atm
Fe 525-625K 25atm

Question 6 : Geometric isomerism yields __________isomers
Two
Five
Four
Three

Question 7 : A substance which ionises to produce hydroxide ions is called __________.
Base
Acid
Salt
None of the above

Question 8 : Hydrogenation of benzene at higher temperature and under pressure yields -------
Cyclohexene
Cyclohexyne
Cyclohexane
Benzaldehyde

Question 9 : A functional group that introduces polarity leads to __________ in the molecule.
increase melting point
Permanent dipole moment
increase saturation point
increase boiling point

Question 10 : A chief source of benzene and its derivatives is __________.
Coaltar
Basalt
Bitumen
Limestone

Question 1 : Increase in melting point as a result of increase in molecular weight is due to increase in ___________.
Hydrogen bonding
Dipole-dipole interactions
electrostatic forces
London forces

Question 2 : In ionic compounds, the positive and negative ions are held together by all these EXCEPT ________.
Hydrogen bonding
London forces
Dipole-dipole interactions
electrostatic forces

Question 3 : A benzene ring is a ________ system.
non conjugation
Conjugation
Hyperconjugation
None

Question 4 : All these affect boiling points except __________.
Molecular structure
London forces
Shape of molecule
Polarity

Question 5 : A chief source of benzene and its derivatives is __________.
Basalt
Limestone
Coaltar
Bitumen

Sodium and potassium are displaced from soap by calcium and magnesium ions in hard water but they are more reactive than calcium and magnesium still they get displaced.Why?

Which isomer of pentane is least compact?

List two or more advantages of using a line structure.

What are various elements of symmetry? Give one example illustrating the presence is such elements in them.