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

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% ϒ 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.3^o > 2^o > 1^o                         ii.1⁰ >2⁰ > 3⁰                             iii.2^o >3^o >1⁰        iv.1^o > 3^o > 2^o

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.