Subject :NSO Class : Class 10
Three hydrocarbons P, Q and R have carbon which combine with hydrogen in the ratio of 3 : 2 : 1 respectively. Which of the following is incorrect about the reactions shown by P, Q and R?
A P does not undergo addition reactions.
B Both Q and R decolourise bromine water.
C Both Q and R give white precipitate with AgNO3 solution dissolved in NH4OH.
D None of these.
Ans 1:
Class : Class 10
THE ANSWER FOR THIS QUESTION IS C.BECAUSE WHEN THE RATIO IS 3:2:1 THEN THE FIRST HYDROCARBON MUST BE A AN ALKANE .THUS OPTION ONE IS WRONG.THE SECOND OPTION WILL ALSO BE INCORRECT BECAUSE BROMIN WATER IS APPLICABLE TO UNSATURATED CARBON COMPOUNDS ,AND 2 AND 3 ARE UNSATURATED CARBON COMPOUNDS,SO OPTION TWO IS ALSO WRONG.FINALLUY THE OPTION THREE IS CORRECT AS TOLLENS TEST IS APPLICABLE TO CARBON COMPOUNDS WIT ALDEHYDE GROUP AND 2 AND 3 DOES NOT CONTAIN ALDEHYDE GROUP