Q. A compound P having the molecular formula  C 2 H 4 O 2   is used as a preservative . It is prepared by the oxidation of the second member of the alcohol family. Q in the present of audified  K 2 C r 2 O 7
a. Identify P and Q.
b. Given chemical equation for the reaction of P with Sodium carbonate. 
c. What is the effect of P on most litmus paper?

Dear Student,


(a) The second member of alcohol family is CH3CH2OH i.e. ethanol. So, Q is  CH3CH2OHP is formed by oxidation of Q, so P is acetic acid i.e. CH3COOH(b) 2CH3COOH + Na2CO3  2CH3COONa + CO2 +H2O(c) P is an acid, so it turns blue litmus red. 

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Please find this answer

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(a)P=ethanoic acid
Q=ethanol
(b)ethanoic acid+sodium carbonate=sodium ethaonate+Carbon dioxide+water
(c)no effect
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a)P-CH3COOH  ;  Q-C2H5OH
b)2CH3COOH+Na2CO3 = 2CH3COONa+CO2+H2O
c)It turns blue litmus red.

 
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 sorry (p turns blue litmus red as it is an acid)
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