(A) (a) What is meant by the term homologous series of carbon compounds? Write molecular formula of any two consecutive members of homologous series of ketones.

(b) Write chemical equation of the reactions of ethanoic acid with

(i) Sodium hydroxide and

(ii) Ethanol (in the presence of an acid); giving the name of the products in each case.

(c) Draw the structure of the molecule of benzene.

OR

(B) (a) Write the molecular formula of ethyne and draw its electron dot structure.

(b) Write chemical equation to show the reaction of ethanol with

(i) Sodium metal

(ii) Ethanoic acid (in the presence of an acid)

(iii) Acidified potassium dichromate

Write the name of the product formed in each case.

(A) (a) A homologous series of carbon compounds is a series of compounds with similar chemical properties due to the presence of the same functional group. The molecular formula of any two consecutive members of homologous series of ketones are $CH_3COCH_3$ and $CH_3COCH_2CH_3$.

(b) (i) $CH_3COOH + NaOH \rightarrow CH_3COONa + H_2O$

(ii) $CH_3COOH + C_2H_5OH \rightarrow CH_3COOC_2H_5 + H_2O$

(c) The structure of the molecule of benzene is $C_6H_6$.

OR

(B) (a) The molecular formula of ethyne is $C_2H_2$. Its electron dot structure is $H - C \equiv C - H$.

(b) (i) $2C_2H_5OH + 2Na \rightarrow 2C_2H_5ONa + H_2$

(ii) $C_2H_5OH + CH_3COOH \rightarrow CH_3COOC_2H_5 + H_2O$

(iii) $C_2H_5OH + 2[KCr_2O_7 + H_2SO_4] \rightarrow CH_3CHO + 2K_2CrO_4 + 2H_2O + 2H_2SO_4$