Question 1

Which of the following compounds will undergo self aldol condensation in the presence of cold dilute alkali?

Accepted Answer

Aldehydes which contain -hydrogen on a saturated carbon, i.e. CH _3 CH _2 CHO will undergo aldol condensation. Although CH _2= C H - CHO also contain a -hydrogen atom but cannot be easily abstracted by a base to form a carbanion and hence does not undergo aldol condensation.

Question 2

An alkene X on ozonolysis gives a mixture of Propan-2-one and methanal. What is X ?

Accepted Answer

Answer option index: 1

Question 3

Fructose reduces Tollen's reagent due to:

Accepted Answer

No solution required.

Question 4

What is X in the following conversion?

Accepted Answer

Pyridinium chloro chromate selectively oxidises a primary alcohol to an aldehyde e.g.

Question 5

The alcohol product(s) of the reduction of 2 -methyl-3-pentanone with LiAlH _ 4 is (are)

Accepted Answer

The resultingcompound is C _ 3 H _ 7 CH ( OH ) C _ 2 H _ 5 which is optically inactive and reaction leads the racemisation

Question 6

The following change can be carried out with

Accepted Answer

LiAlH _ 4 will give the desired compound.

Question 7

What is the product of the following reaction?

Accepted Answer

Only-CHO group reacts with CN ^ - ion and the reaction is

Question 8

Product (D) in above reaction is:

Accepted Answer

(A) (B) (C) (D)

Aldehydes and Ketones — Previous Year Questions & Solutions