Q23 of 46 Page 1

Complete the following reactions:

(i)


(ii)


(iii)


OR


Write the chemical equations for the following reactions:


(i) Propanone is treated with dilute Ba(OH)2.


(ii) Acetophenone is treated with Zn(Hg)/conc. HCl


(iii) Benzoyl chloride is hydrogenated in presence of Pd/BaSO4


(i) When benzaldehyde is treated with sodium cyanide in acidic medium it undergoes addition reaction to give benzene cyanohydrin.



(ii) the given reaction is an example of electrophilic substitution. Here Cd element is replaced by two moles of acetyl chloride to give benzylmethyl ketone or 1-phenylpropan-2-one.



OR


(i) Propane when treated with with Ba(OH)2 undergoes Aldol condensation to give a ketol product.


Rxn:



(ii) Acetophenone is treated with Zn(hg)/con. HCl


Aldehyde and ketone when treated with Zn (Hg) along with conc. HCl it undergoes reduction to give ethyl benzene.



This reaction is also called as Clemmensen reduction.


(iii) Benzoyl chloride undergoes partial reduction as the poisoned catalyst reduces the activity of palladium and thus it gives benzaldehyde as the product.


Rxn:



The above reaction is called as Rosenmund reaction, and the catalyst used is called Lindlar’s catalyst.

More from this chapter

All 46 →
21

(i) Out of and which one is more reactive towards SN1 and why?

(ii) Write the product formed when p-nitrochlorobenzene is heated with aqueos NaOH at 443 K followed by acidification.


(iii) Why dextro and laevo – rotatory isomers of butan-2-ol are difficult to separate by fractional distillation?


 22

An aromatic compound ‘A’, on heating with Br2 and KOH forms a compound ‘B’ of molecular formula C6H7N which on reacting with CHCl3 and alcoholic KOH produces a foul smelling compound ‘C’. Write the structures and IUPAC names of compounds A, B and C.

 24

Differentiate between the following:

(i) Amylose and amylopectin


(ii) Peptide linkage and glycosidic linkage


(iii) Fibrous proteins and globular proteins


OR


Write the chemical reactions to show that open structure of D-glucose contains the following:


(i) Straight chain


(ii) Five alcohol groups


(iii) Aldehyde as carbonyl group


 25

E° for the given redox reaction is 2.71 V


Calculate Ecell for the reaction. Write the direction of flow of current when an external opposite potential applied is


(i) Less than 2.71 V and


(ii) Greater than 2.71 V


OR


(a) A steady current of 2 A was passed through two electrolytic cells X and Y connected in series containing electrolytes FeSO4 and FeSO4 until 2.8 g of Fe deposited at the cathode of cell X. how long did the current flow? Calculate the mass of Zn deposited at the cathode of cell Y.


(b) In the plot of molar conductivity (Λm) v/s square root of concentration (c1/2), following curve is obtained for two electrolytes A and B:



Answer the following:


(i) Predict the nature of electrolytes A and B


(ii) What happens on extrapolation of Λm to concentration approaching zero for electrolytes A and B?