NIPPER ORGANIC CHEMISTRY BITS
1.
Organic chemistry deals with the study of:
(a) the compounds obtained from plants only
(b) the compounds obtained from animals only
(c) the compounds obtained from minerals
(d) the compounds of carbon
2.
The reason for a very large number of carbon compounds is :
(a) its high reactivity
(b) its property of catenation
(c) its capacity to form covalent as well as ionic compounds
(d) its variable valency
3.
4.
5.
Who is called the father of chemistry?
(a) Faraday
(b) Wohler
(c) Berzelius
(d) Lavoisier
Tetrahedral nature of bonding in carbon atom was first shown by
(a) Kekule
(b) Lewis
(c) Kolbe
(d) van’t Hoff and Le-Bel
All the carbon atoms of the structure assume tetrahedral hybridization in:
(a) 2-methyl propane
(b) benzene
(c) ethylene
9.
The bond between carbon atom (1) and carbon atom (2) in
compound N
7.
11.
9.
(d) butadiene
1
2
C
CH
CH2 , involves hybridization:
(a) sp2 and sp2
(b) sp3 and sp
(c) sp and sp2
(d) sp and sp
The compound having both sp2 –and sp3 –hybridized carbon atoms is:
(a) propane
(b) ethane
(c) propyne
(d) propadiene
The C
H bond distance is the longest in:
(a) C2H2
(b) C2H4
(c) C2H6
(d) C2H2Br2
The enolic form of acetone contains:
(a) 9 sigma bonds, 1 pi bond and 2 lone pairs of electrons
(b) 8 sigma bonds, 2 pi bonds and 2 lone pairs of electrons
(c) 10 sigma bonds, 1 pi bond and 1 lone pair of electrons
(d) 9 sigma bonds, 2 pi bonds and 1 lone pair of electrons
10.
14.
How many sigma and pi bonds are there in tetracyano ethylene molecule
(a) 9  and 9
(b) 9  and 7
(c) 5  and 9
(d) 5  and 7
The hybridization of carbon atoms in C  C single bond of CH3 C  C is
(a) sp3 -sp3
(b) sp2 –sp3
(c) sp3 -sp
(d) sp-sp2
15.
The Cl
C
Cl angle in 1,1,2,2,-tetrachloroethene and
tetrachloromethane will be about:
13.
14.
(a) 900 and 109.50
(b) 109.50 and 900
(c) 109.50 and 1200
(d) 1200 and 109.50
The shape of acetylene molecule is:
(a) linear
(b) planar
(c) pyramidal
(d) tetrahedral
The compounds in which carbon uses only its sp3 –hybrid orbitals for bond formation is
(a) HCOOH
(c) NH2CONH21
15.
16.
17.
(b) (CH3)3 COH
(d) (CH3)3 C – CHO
Resonance is due to:
(a) delocalization of sigma-electrons
(b) delocalization of pi-electrons
(c) migration of H-atoms
(d) migration of proton
Resonance structures of a molecule do not have:
(a) identical arrangement of atoms
(b) nearly the same energy content
(c) the same number of paired electrons
(d) identical bonding
Which of the following statements is false about resonance?
(a) It increases stability of the molecule
(b) It leads to similar type of bonding
(c) It increases reactivity of the molecule
(d) It decrease reactivity of the molecule
18.
C-H bond energy in ethane, ethane and ethene is :
(a) equal in all the three compounds
(b) maximum in ethane
(c) maximum in ethane
19.
20.
21.
22.
23.
24.
(d) maximum in ethene
s-character of sp-sp2 –and –sp3-hybrid orbitals follows the decreasing order:
(a) sp3sp2sp
(b) spsp2sp3
(c) sp2sp3sp
(d) sp2spsp3
The molecule of fluorine is produced by the overlapping of :
(a) s-s
(b) s-p
(c) p-p
(d) none of these
Number of pi electrons present in naphthalene is :
(a) 4
(b) 6
(c) 10
(d) 14
All bonds in benzene are equal due to :
(a) isomerism
(b) tatutomerism
(c) inductive effect
(d) resonance
The maximum possible number of hydrogen bonds , a water molecule can form is:
(a) 4
(b) 3
(c) 2
(d) 1
Sublimation is a process in which a solid:
(a) changes into another allotropic form (b) changes into liquid form
(c) changes into vapour form
25.
26.
27.
(d) none of the above
Naphthalene is a volatile solid. It is best purified by:
(a) crystallization
(b) distillation
(c) steam distillation
(d) sublimation
Methanol and acetone can be separated by:
(a) fractional distillation
(b) distillation
(c) steam distillation
(d) vacuum distillation
Separation of two substances by fractional crystallization depends upon
their differences in:
28.
(a) densities
(b) volatility
(c) solubility
(d) crystalline shape
Aniline is separated from a mixture by:
(a) fractional crystallization
(c) vacuum distillation
29.
(b) fractional distillation
(d) steam distillation
Glycerol is purified by :
(a) steam distillation
(b) vacuum distillation
(c) fractional distillation
(d) simple distillation
30.
31.
32.
33.
Two immiscible liquids are separated by:
(a) separating funnel
(b) fractional distillation
(c) chromatography
(d) sublimation
Latest technique for purification, isolation and separation of organic compounds is:
(a) chromatography
(b) fractional distillation
(c) crystallization
(d) vacuum distillation
Steam distillation is applied to those organic compounds which are steam volatile and:
(a) soluble in water
(b) insoluble in water
(c) sparingly soluble in water
(d) insoluble in all solvents
In paper chromatography:
(a) the mobbing phase is a liquid and stationary phase is a solid
(b) the moving phase is a solid and stationary phase is a liquid
(c) both the phases are liquids
(d) both the phases are solids
34.
35.
36.
Oils are purified by:
(a) fractional distillation
(b) steam distillation
(c) vacuum distillation
(d) simple distillation
Chromatography technique is used for the separation of :
(a) small samples of mixtures
(b) plant pigments
(c) dye stuffs
(d) all
In column chromatography the moving phase is:
(a) the substance which are to be separated
(b) eluent
(c) adsorbent
(d) mixture of eluent and substances to b e separated
37.
38.
The chromatography technique was developed by:
(a) Soxhlet
(b) Tswett
(c) Victor Grignard
(d) Liebig
The most satisfactory method for separating sugars is:
(a) fractional distillation
(b) vacuum distillation
(c) chromatography
39.
(d) steam distillation
Which one of the following reagent is useful for separating aniline from nitrobenzene ?
(a) aq. NaHCO3
(b) aq. NaHSO3
(c) aq. HCl
40.
A mixture of phenol and benzoic acid will completely dissolve in an aqueous solution of :
(a) HCl
(c) NaHCO3
41.
(d) aq. dilute H2SO4
(b) NaCl
(d) NaOH
Silica gel is used for keeping away the moisture because it:
(a) adsorbs water molecule
(b) absorbs water molecule
(c) reacts with water
(d) none of the above
42.
43.
44.
45.
(A)
46.
47.
Separation and purification of organic compounds cannot be carried out by:
(a) distillation
(b) extraction with solvents
(c) crystallization
(d) precipitation
Fractional distillation is used to separate liquids which differ in their boiling points by:
(a) 0-100C
(b) 10-200C
(c) 20-400C
(d) 40-800C
Sublimation method cannot be used for the purification of:
(a) naphthalene
(b) benzoic acid
(c) urea
(d) camphor
(A) is a higher phenol and (B) is an aromatic carboxylic acid. Separation of a mixture of
and (B) can be carried out easily by using a solution of:
(a) NaOH
(b) lime
(c) NaHCO3
(d) Na2CO3
The technique of gas liquid chromatography is suitable for compounds which are:
(a) soluble in water
(b) highly volatile
(c) vaporize without decomposition
(d) liquids
Allyl isocyanide has :
(a) 9 sigma and 4 pi bonds
(b) 8 sigma and 5 pi bonds
(c) 8 sigma, 3 pi and 4 non-bonded electrons
(d) 9 sigma, 3 pi and 2 non-bonded electrons
48.
49.
Which of the following have high electron affinity?
(a) Cl
(b) F
(c) N
(d) O
Match the following:
(A) Simple distillation
(i) to separate the liquids which
are steam
volatile, insoluble in
water and contains non-volatile impurities.
(B) Fractional distillation
(ii) to separate liquids which decomposes
at a temperature below their normal
boiling points
(C) Vacuum distillation
(iii) to separate two or more liquids which
have boiling points close to each other.
(D) Steam distillation
(iv) to separate liquid from
non- volatile impurities
50.
A
B
C
D
(a)
(i)
(ii)
(iii)
(iv)
(b)
(iv)
(iii)
(ii)
(i)
(c)
(iii)
(i)
(iv)
(ii)
(d)
(ii)
(iv)
(i)
(iii)
Match the following :
(A) Sublimation
(i) Ether + tolune
(B) Distillation
(ii) o-Nitrophenol + p-nitrophenol
(C) Vacuum distillation
(iii) Benzoic acid + benzaldehyde
(D) Steam distillation
(iv) Glycerol from spent lye
A
B
C
D
(a)
(iv)
(iii)
(ii)
(i)
(b)
(i)
(ii)
(iii)
(iv)
(c)
(iii)
(i)
(iv)
(ii)
(d)
(ii)
(iv)
(i)
(iii)