Q55 of 312 Page 242

The functional group present in propanal is:

Propanal

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53 Butanone is a four-carbon compound having the functional group: 54 The molecular formula of the third member of the homologous series of ketones is: 56 An organic compound having the molecular formula C3H6O can exist in the form of two isomers A and B having different functional groups. The isomer A is a liquid which is used as a solvent for nail polish. The isomer B is also a liquid. An aqueous solution of one of the lower homologues of B is used for preserving biological specimens in the laboratory

(a) What is compound A?


(b) Write the electron-dot structure of A.


(c) What is compound B?


(d) Write the electron-dot structure of B.


(e) Name the lower homologue of compound B which is used in preserving biological specimens.

 57 A hard material X which is mined from the earth is used as a household fuel and also for the generation of electricity at Thermal Power Stations. A soft material Y is also used as a fuel in the form of candles. A gaseous material Z which occurs along with petroleum is increasingly being used as a fuel in running vehicles in its compressed form.

(a) What are materials, X, Y and Z?


(b) When materials X, Y and Z are burned separately:


(i) Which material burns by producing a yellow, luminous flame?


(ii) Which material ultimately bums without producing a flame?


(iii) Which material can bum in a gas stove by producing a blue flame?