NEET Questions Solved


Which is the most suitable reagent among the following to distinguish compound (III) from rest of the compounds?                                                                                                 

I. CH3-CC-CH3

II. CH3-CH2-CH2-CH3

III. CH3-CH2-CCH

IV. CH3-CH=CH2

(a) Br2/CCl4                     (b) Br2/CH3COOH

(c)Alk.KMnO4                   (d) Ammonical AgNO3

(d) It may be noted that only the terminal alkynes react with ammonical silver nitrate. Therefore, this reaction can be used to distinguish between 1-alkynes and others such as alkane, alkenes and non-terminal alkynes.

     CH3-CH2-CCH + 2[Ag(NH3)2]NO3 CH3CH2CCAg

                                                                         white ppt.

Difficulty Level:

  • 20%
  • 14%
  • 24%
  • 43%

Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?       

(a) NaNH2            (b) HCl             (c) O2                 (d) Br2

Difficulty Level:

  • 62%
  • 14%
  • 8%
  • 17%

A compound is treated with NaNH2 to give sodium salt. Identify the compound.                      

(a) C2H2                  (b) C6H6

(c) C2H6                   (d) C2H4

Difficulty Level:

  • 63%
  • 14%
  • 11%
  • 14%

When chlorine is passed through propene at 400°C, which of the following is formed?            

(a) PVC                         (b) Allyl chloride  

(c) Nickel chloride          (d) 1,2-dichloro ethane

(b) When chlorine gas is reacted with propene at high temperature (400°C), then substitution takes place in place of addition reaction. Hence, allyl chloride is formed.

 CH3-CH=CH2 + Cl2 400°CC|H2-CH=CH2 + HCl          Cl                                   

Difficulty Level:

  • 28%
  • 47%
  • 5%
  • 22%

When acetylene is passed through dil.H2SO4 in presence of HgSO4, the compound formed is

(a) ether                           (b) ketone

(c) acetic acid                    (d) acetaldehyde


Benzene reacts with CH3Cl in the presence of anhy. AlCl3 to form

(a) toluene

(b) chlorobenzene

(c) benzylchloride

(d) xylene


In the following reaction,

 


2-bromopentane is heated with potassium ethoxide in ethanol. The major product obtained is 

(a) 2-ethoxypentane                    (b)pentene-1

(c) trans-pentene-2                     (d) cis -pentene-2


CH3-CC-HCH3MgBrCH4 + (A)(ii) H2O/H+(i) CO2(B); (B) will be

(1) H3C-CH2-CH2-COOH                                (2) CH3-CC-CH3

(3) H3C-CC-COOH                                      (4) H3C-CH=CH-COOH

(3)  CH3-CC-HCH3MgBr H3C-CC-Mg+Br  (ii) H2O/H+(i) CO2H3C-CC-COOH   

                                          (A)                                         (B)

Difficulty Level:

  • 19%
  • 12%
  • 48%
  • 23%

The monochlorinated products (excluding stereo-isomers) obtained from the reaction is:

(1) 4            (2) 5              (3) 6            (4) 7

 

Difficulty Level:

  • 15%
  • 66%
  • 14%
  • 7%