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Structural formula -Part 4

Structural formula-

source :commons.wiki media.org

Structural formula-

Q 1-Molecular formula of compd ‘A’ is C2H7N. It gives bad smelling compd with CHCl3 & Alc. KOH. It gives  compd ‘B’ with HNO2 & ‘B’on oxidation gives ‘C’ & then ‘D’. Compd ‘C’ gives Ag mirror with Tollen’s reagent . Compd ‘D’ gives CO2 gas with NaHCO3 . Explain with equations & give name & formula of A,B,C&D.

Ans.

(1)  compd ‘A’  C2H7N gives bad smelling compd with CHCl3 & Alc. KOH, so compd ‘A’ is primary amine.

compd ‘A’ is C2H5NH2.

C2H5NH2 + CHCl3 + 3 KOH(Alc.) —–>C2H5NC        +   3KCl  +   3H2O

‘A’                                                                (bad smelling compd)

(2) Compd ‘A’ gives ‘B’ with HNO2.

C2H5NH2 + HNO2 —–>C2H5OH +N2 +H2O

‘A’                                     ‘B’

Hence compd ‘B’ is C2H5OH.

Compd ‘C’gives Ag mirror with Tollen’s reagent, so it is an aldehyde

CH3CHO +Ag2O ——-> CH3COOH + 2Ag

‘C’

Compd ‘D’ gives CO2 with NaHCO3, so it is an acid.

CH3COOH +NaHCO3 ——> CH3COONa +H2O +CO2

‘A’ is C2H5NH2 (ethyl amine or ethanamine) ; ‘B’ is C2H5OH (ethyl alcohol or ethanol) ; ‘C’ is CH3CHO (acetaldehyde or ethanal) ; ‘D’ is CH3COOH (acetic acid or ethanoic acid) .

 

 


Q 2- Mol.formula of compd ‘A’ is C2H6O.It reacts with conc.H2SO4 at 140 degree Centi. to form compd ‘B’. Compd ‘B’ reacts with cold HI then forms ‘A’ & one other compd ‘C’ .   Compd ‘C’ on hydrolysis gives ‘A’. Give equations & name of A , B & C.

Ans.

Mol.formula of ‘A’ =C2H6O

‘A’reacts with conc.H2SO4 at 140 degree Centi. to form compd ‘B’. Compd ‘B’ reacts with cold HI then forms ‘A’.thus ‘A’ is ethyl alcohol & ‘B’ is ether.

C2H5OH + H2SO4 —–>C2H5HSO4 +H2O

C2H5HSO4 + C2H5OH —–> C2H5OC2H5 + H2SO4

‘B’

C2H5OC2H5 + HI —-> C2H5OH + C2H5I

‘B’                              ‘A’                 ‘C’

C2H5I +H.OH —-> C2H5OH +HI

‘C’                                  ‘A

‘A’ is C2H5OH (ethyl alcohol or ethanol) ; ‘B’ is  C2H5OC2H5 (diethyl ether or ethoxy ethane) ; ‘C’ is C2H5I (ethyl iodide or iodo ethane)

 

 

 

 

 

 

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Saroj Bhatia: Dr. Saroj Bhatia is an Ph.D in chemistry who has been teaching chemistry for over a decade. Currently she is a respected principal of a renowned college in her hometown. She took this medium for online users. Her proudest achievement is helping people learn chemistry.
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