Most Probable Organic Chemistry Questions: CHSE (+2 Science)
Most Probable Organic Chemistry Questions: (CHSE +2 Science Class 12th) [All type , Short and long]
The Soul of Chemistry
VST - 3 (Organic Chemistry)
F.M: 70 Time: 3 Hour
F.M: 70 Time: 3 Hour
Answer all questions from Section -
A, ten from Section - B and three from Section - C
Section - A
[1 X 5 = 5]
1.Choose correct answer
a) Which
of the following exists as Zwitter ion?
i)
vitamins ii)Hormons iii) Amino acids
iv)Lipids
b) Which
type of medicine is used for treatment of pneumonia?
i)
antipyretics ii) antibiotics iii) antiseptics iv) analgesics
c) Which
of the following is not a co polymer?
i)Backelite ii)Nylon – 6,6 iv) Terylene v)Teflon
d) The
insecticide containing 99% Ï’ isomer of benzene hexachloride is
known as
i)Lindane ii)TNT iii) TNB iv) Malathion
e)When
primary amine reacts with chloroform in ethanolic KOH then product is
i)Cyanide ii)isocyanide iii)aldehyde iv) ketone
2. [1X10=10]
a)The compound which on reacts with
nitrous acid gives only ntrosamine
i)methylamine ii)Aniline iii)dimethylamine v)triethylamine
b)The compound having the molecular
formula C3H9N represents
i)trimethyl amine ii) n-propyamine iii) isopropyl amine iv) All of these
c)Sulphonation of nitrobenzene gives
i) p-nitrosulphonic acid ii) m- nitrosulphonic acid
iii)o- nitrosulphonic acid iv)o and p- nitrosulphonic acid
d)The dehydration of acetamide by P2O5
gives
i)methyl amine ii)Ethyl amine
iii)methyl cyanide iv)Acetaldehyde
e)The primary and tertiary amine can
be distinguished by
i)Hinsberg reagent ii)Grignard’s reagent
iii)Fehing solution iv)Tollen’s reagent
f)Natural rubber is the polymer of
i)Ethylene ii)Vinyl chloride iii)Neoprene iv)Isoprene
g)Phenyl magnesium bromide on reacts
with carbon dioxide in presence of dry ether followed by hydrolysis gives
i)Acetophenone ii)benzophenone
iii)Benzaldehyde iv)Benzoic acid
h) Iodoform reaction is not given by
i)Butanol ii)Butane – 2 one iii)Ethanol iv)Butane – 2 –ol
i)Chlorobenzene is formed by the reaction of chlorine with
benzene in the presence of AlCl3. Which following species attacks
the benzene ring in this reaction?
i)Cl - ii)Cl + iii)ALCl3 iv)Cl2 +
j)The reagent used for separation of
acetaldehyde and acetophenone is:
i)NaHSO3 ii)C6H5NHNH2 iii)NH2OH iv) I2 + NaOH
3. [1X10=10]
a.Which of the following is most
acidic
i.Benzyl alcohol ii.Cyclohexanol
iii.Phenol iv.m-chlorophenol
b. Which of the following is
optically active
i.CH3CH2OH ii.CH3CH(OH)CH2OH
iii.CH3CHOHCH3 iv.CCl2F2
c. The compound that is most
reactive towards electrophonic substitution is:
i.Toluene ii.Benzene iii.Nitrobenzene
iv.Benzoic acid
d. When n-propyl bromide on treatment
with ethanolic solution of potassium hydroxide produces:
i.Propene ii.Propane iii.propyne iv.Propanol
e.Carbolic acid is the name used
for:
i.CCl4 ii.CHCl3 iii.C6H5OH iv.H2CO3
f.Ethyl alcohol reacts with
following to form a compound of fruity smell.
i.PCl5 ii.K2Cr2O7
+ H2SO4
iii.CH3COOH iv. CH3COCH3
g.The order of different alkyl
halide towards SN2 type reaction is:
i.3o > 2o >
1o ii.10
>20 > 30 iii.2o >3o >10 iv.1o > 3o >
2o
h.Alkyl Chloride can be obtained
from alcohol by reacting with
i.HCl/ZnCl2 ii.PCl5 iii.SOCl2 iv.All
of these
i.Which of the following on reaction
with methyl magnesium iodide followed by hydrolysis will give 2-methyl
propanol:
i.CH3CHO ii.CH3COCH3
iii.CH3CH2CHO iv.CH3CH(Br)CH3
j.Which of the following will
undergo Cannizarro’s reaction:
i.CH3CHO ii.CH3CH2CHO
iii.(CH3)2CHCHO iv.None
of these
4. [1X10=10]
a.Which reagent is used for
dehydrohalogenation of an alkyl halide?
b. Which product is obtained when
ethanol on treated with concentrated H2SO4 at about 413K?
c.What happens when phenol is
treated with conc. Sulphuric acid. Give equation.
d. Give a chemical test to
distinguish between acetophenone and benzophenone.
e. Define Bayer’s reagent and give
one use.
f.Which have higher boiling point
and why? Acetic acid and acetaldehyde.
g.Write the different optical
isomers of 2-hydroxy propanoic acid.
h.Formic acid reduces Tollen’s
reagent. Explain.
i.Which one is more soluble in water
and why? Ethyl amine and diethyl amine.
j. Write the monomer of Nylon-6,10
and give one use.
Section –B [2X10=20]
5.a. Write the difference between
soaps and detergents.
b.Define antipyretic drug, with two examples.
c. Which one is more acidic and why?
Benzoic acid and acetic acid
d. What happens when excess ethyl
bromide reacts with ammonia? Give equation.
e.Define aldol condensation with
example.
f.Which acid is more soluble in
water and why? Formic acid and acetic acid.
g. write the difference between
aldehyde and ketone?
h.Define Reimer-Tiemann reaction.
i.How methyl amine is prepared from
acetamide. Write the name of the reaction.
j.Why phenol is acidic in nature?
Explain.
k.Define Etard’s reaction.
l. Write the difference between HDPE
and LDPE.
m.Why halogen atom in alkyl halide
is active but in haloarene is inert? Explain.
n. How ethylisocyanide can be
prepared from amine?
Section – C [5X3=15]
6. Write Short notes on:
a.SN1 reaction b.Williamson’s synthesis
7. Give two method of preparation of
acetic acid. How does it react with
i. CH3OH/H+ ii. Cl2/Red P and give two uses.
8. Write short notes on:
i. Etard’s
reaction ii.
Cannzzar o’s reaction
9. a.
Which one is more basic and why? Aniline
and benzyl amine.
b.
Define esterification.
10. Give three methods of preparation
of acetaldehyde. How does it react with:
i. Tollen’s reagent. ii. Fehling solution and give two uses.
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Other important questions will be given in next VST-3a very soon.
