Q8 of 26 Page 1

Name the reagents used in the following reactions:

(i)


(ii)


(i) NaBH4(sodium borohydride)

NaBH4 is highly selective reducing agent. It selectively reduces ketones and aldehydes to alcohols avoiding further reduction to alkanes. Hence is the most suitable reagent for the above reaction.


(ii) Alkaline KMnO4 is used. Potassium permanganate is a strong reducing agent. When we have alkyl substituted benzene it is oxidised to benzoic acid irrespective of the length of alkyl chain.


Note: Alkaline KMnO4 works only when benzylic hydrogen is present. If a tertiary carbon is attached to the benzene ring no reaction occurs.


More from this chapter

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6

What are transition elements? Write two characteristics of the transition elements.

 7

(i) Write down the IUPAC name of the following complex:

(en)]Cl


(ii) Write the formula for following complex:


Pentaamminenitrito-O-Cobalt(III)


 9

What is meant by positive deviation from Raoult’s law? Give an example. What is the sign of for positive deviation?

OR


Define azeotropes. What type of azeotrope is formed by positive deviation from Raoult’s law? Give an example.


 10

(a) Following reactions occur at cathode during electrolysis of aqueous silver chloride solution:


On basis of their standard reduction potential (E0) values, which reaction is feasible at cathode and why?


(b) Define limiting molar conductivity. Why conductivity of an electrolytic solution decreases with the decrease in concentration?