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ORGANIC CHEMISTRY –BASIC PRINCIPLES &TECHNIQUES
ONE MARK QUESTIONS
1 Write the structural formula of the following (1 mark each)
a. 2,3-Dibromo-1-phenylpentane b. 6-Hydroxyheptanal
c. p-Nitroaniline d. Cyclohex-2-en-1-ol
e. 4-Ethyl-1-fluoro-2-nitrobenzene f. Pent-4-en-2-ol
g. 3,4-Dimethylphenol h. 3-Nitrocyclohexene
i. m-Nitrophenol
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2 Are the following IUPAC names correct? If not write the correct names. (1 mark each)
a) 2,2-dimethyl pentane b) 2,5,7-trimethyloctane c) 4-chloro-2-methylpentane
y.
da
d) but-4-ol-1-yne e) 1-hydroxyethanoic acid f) Propan-2-ol
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g) 2-Ethylpent-2-ene h) Hexa-1,6-diene i) 4-ethyl-3-methylhexanej) Pent-4-ene
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3 Write IUPAC names for the following (1 mark each)
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a) b) c) d)
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e) O f) (CH3)3C-CH2-CHO g) HO-CH2-CH2-COOH
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h) CH3 CO CH2 CHO i) (CH3)3C CH (C2H5) CH3 j) CH2 = CH CH2 CH = CH2
k) HOOC CH (CH3) CH2 CH2 CH3 l) CH3 CH2 CH2 NO2 m) HO CH (CH3) CH2 CHO n)
H2N CH=CH-COOH o) CH3 CO CO C2H5 p) CH3 CH2 CH2 COO C2H5
q) CH3 CH Cl2 r) HOOC-COOH s) CH2 = CH CH2 CC CH3 t) I-(CH2)3 COOH u)
CH3 CO COOH v) (CH3 )2 CH CH(C2H5) CH3w) CH3CH(CH3)CH2CH2CH=CH2
x)CH3C(CH3)2CH2CH2CH2CH(C2H5)CH3
TWO MARKS QUESTIONS
1 Distinguish between the following with example (2 marks each)
a) Nucleophile and Electrophile b) Heterolytic and Homolytic fissions
2 Give reason:
a) Metallic sodium is used to prepare Lassaigne’s extract.
b) Lassaigne’s extract is boiled with dil HNO3 before testing for halogens.
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3 Arrange the following in the increasing order of their stabilities:
a) (CH3)3CCH2+, (CH3)3C+ , CH3CH2CH2+ , CH3CH+CH2CH3
b) (CH3)2CH- , (CH3)3C - , CH3CH2- , CH3-
4 Define isomerism. Draw the structural isomers of C5H12 and C4H10
5 Give a pair of functional isomers of
C2H4O2 b) C3H6
6 Write short note on the following with the help of an example:
a) Metamerism b) Position isomerism
THREE MARKS QUESTIONS
1 Write the bond line formula for
a) Pentan-2-one
b) 3-Formyl hexane-1,6-dioic acid
c) 2,3-dimethyl butanal
2 Which is more stable and why?
a) NO2 CH2CH2 O-orCH3 CH2CH2 O-
b) 3,3-dimethyl-1-buteneor3-methyl-1-pentene
c) CH3CH2+or(CH3)2 CH+
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3 Explain with examples
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a) Resonance effect b) Inductive effect c) Electromeric effect
4
steam distillation? y.
What is the difference between distillation, distillation under reduced pressure and
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5 Discuss the principle behind the following techniques taking an example in each case.
Crystallization b) Chromatography c) Sublimatiom
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6 Write one chemical test to detect the presence of the following elements in a given organic
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compound.
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a) Nitrogen b) Sulphur c) Phosphorous
7 Draw the resonating structures of
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a. Aniline (C6H5NH2)
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b. Nitrobenzene(C6H5NO2)
c. Prop-2-enal
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8 Explain the principle behind
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a) Carius method of estimation of halogens
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b) Kjeldahl’s method of estimation of nitrogen
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