B.Sc. First year (UG degree course) Semester First, Organic
chemistry paper-II
Chapter – STRUCTURE
AND BONDING
Multiple choice Questions
1.Compound in which
carbons use only sp2 hybrid orbitals for bond formation is
a) CH3CH2CH3
b) CH3C=CH2
c) CH3=C=CH2
d) CH2=CH-CH=CH2
Answer:(d)
2.The order of of stability of carbonium ions is
a) tertiary > secondary > primary
b)secondary > tertiary > primary
c) primary > secondary > tertiary
d)primary > tertiary > secondary
Answer :(a)
3. Which of
the following carbonium ions will be most stable ?
a) CH3CH2 +
b) (CH3)2 CH+
c) CH2=CHCH2+
d) CH3+
Answer:(d)
4. Resonance structures of a molecule have
a) same arrangement of atoms
b) different arrangement of atoms
c) different number of paired electrons
d) None of these
Answer:(a)
5. Which of the following compounds will show dipole moment
a) Cis-1, 2-dichloroethylene
b)benzene
c) trans. 1, 2-dichloroethylene
d)p-dichlorobenzene
Answer:(a)
6. The order of stability of carbanions is '
a) primary > secondary > tertiary
b)secondary > tertiary > primary
c) tertiary > secondary > primary
d)tertiary > primary > secondary
Answer:(a)
7. Which of the
following compounds have planar molecules?
a) ethyl alcohol
b)formaldehyde
c) diethyl ether
d)Ehanol
Answer:(b)
8. In stable organic
compounds, carbon will always form
a) 2 bonds
b)4 bonds
c) 3 bonds
d)5 bonds
Answer: (b)
9. Compound in which carbons use only sp3 hybrid
orbitals for bond formation is
a) CH3CH2CH3
b) CH3C=CH2
c) CH3=C=CH2
d) CH2=CH-CH=CH2
Answer: (a)
10.Which molecule has a
nonzero dipole moment ?
a) Cl2
b)CO2
c) CCl4
d)CHCl3
Answer: (d)
