The major product Z formed in the following sequence of reactions is :
$$C_2H_6 \xrightarrow{Cl_2, \text{UV light}} X \text{ (monochlorinated product)} \xrightarrow{NH_3} Y \xrightarrow{(i) NaNO_2, HCl, (ii) H_2O} Z$$
Reaction Pathway Analysis
The question asks for the major product (Z) formed from a sequence of reactions starting with ethane ($C_2H_6$).
Step 1: Monochlorination of Ethane
Ethane ($C_2H_6$) reacts with chlorine ($Cl_2$) under UV light via a free-radical substitution mechanism. This produces monochlorinated ethane ($X$).
Reaction: $C_2H_6 + Cl_2 \xrightarrow{UV \text{ light}} C_2H_5Cl + HCl$
Thus, $X$ is monochlorinated ethane, $C_2H_5Cl$.
Step 2: Ammonolysis of Ethyl Chloride
Monochlorinated ethane ($X = C_2H_5Cl$) reacts with ammonia ($NH_3$) through nucleophilic substitution (ammonolysis) to form ethylamine ($Y$).
Reaction: $C_2H_5Cl + NH_3 \rightarrow C_2H_5NH_2 + HCl$
Thus, $Y$ is ethylamine, $C_2H_5NH_2$. This is a primary amine.
Step 3: Reaction of Primary Amine with Nitrous Acid
The primary amine ($Y = C_2H_5NH_2$) is treated with sodium nitrite ($NaNO_2$) and hydrochloric acid ($HCl$) at low temperatures. This generates nitrous acid ($HONO$) in situ.
Reaction: $NaNO_2 + HCl \rightarrow HONO + NaCl$
Primary aliphatic amines react with nitrous acid ($HONO$) to form unstable diazonium salts, which immediately decompose in the aqueous acidic medium to yield alcohols, nitrogen gas, and regenerate the acid.
Reaction: $C_2H_5NH_2 + HONO \xrightarrow{HCl} [C_2H_5N_2]^+Cl^- \xrightarrow{H_2O, \text{heat}} C_2H_5OH + N_2 + HCl$
Therefore, the final product $Z$ is ethanol, $C_2H_5OH$.
Conclusion
The major product Z formed in the sequence is ethanol ($C_2H_5OH$).
Similar Questions
Select the reagents that reduce nitriles to primary amines :
A. (i) $LiAlH_4$ ; (ii) $H_2O$
B. $Sn + HCl$
C. $H_2 / Ni$
D. $Na(Hg) / C_2H_5OH$
E. $Br_2 / \text{aq. } NaOH$
Choose the correct answer from the options given below :- The pair of molecules that are metamers among the following is :
- Compound P ($C_8H_8O$) gives a red orange precipitate with 2,4-DNP reagent and it does not reduce Fehling's reagent. On drastic oxidation with chromic acid, P gives an aromatic product Q that produces effervescence on treating with aq. $NaHCO_3$. Compounds P and Q, respectively, are :
The correct IUPAC name of the following compound is :
In the following reaction sequence, X and Z respectively are :
The number of chlorine atoms present in the organic products X and Y of the following reactions, respectively, are :
Two products X and Y are formed in the following reaction sequence.
The suitable method that can be used for the separation of products X and Y is :List I (Reactions) List II (Reagents) A. 
I. (i) oleum, (ii) $NaOH, \Delta$, (iii) $H^+$ B. $CH_3COOH \rightarrow CH_3CH_2OH$ II. (i) $O_3$, (ii) $H_2O/H^+$ C. $CH_3CH_2CH_2OH \rightarrow $ 
III. (i) $CH_3OH, H^+$, (ii) $H_2$, catalyst D. 
IV. (i) conc. $H_2SO_4, \Delta$, (ii) $H_2O$ Match List I with List II.
The following two reactions give the same foul smelling product Z.
$$C_2H_5Cl \xrightarrow{X} Z$$
X and Z, respectively, are :- Given below are two statements:
Statement-I : Oxidation of p-nitrotoluene with acidic $KMnO_4$ gives an acid that is stronger than benzoic acid.
Statement-II : Reduction of p-nitrotoluene with Sn/HCl followed by neutralization gives an amine that is more basic than aniline.
In light of the above statements, choose the most appropriate answer from the options given below.
Important Questions from Organic Chemistry
- The mass of benzanilide obtained from the benzoylation reaction of 5.8 g of aniline, if yield of product is 82%, is _________ g (nearest integer).
(Given molar mass in $\text{g mol}^{-1} \, \text{H} : 1, \text{C} : 12, \text{N} : 14, \text{O} : 16$) - In Dumas method for estimation of nitrogen, 0.50 g of an organic compound gave 70 mL of nitrogen collected at 300 K and 715 mm pressure. The percentage of nitrogen in the organic compound is ______ %.
(Aqueous tension at 300 K is 15 mm). Given below are two statements:
Statement I: The dipole moment of R-CN is greater than R-NC and R-NC can undergo hydrolysis under acidic medium to produce
Statement II: R-CN hydrolyses under acidic medium to produce a compound which on treatment with $\text{SOCl}_2$, followed by the addition of $\text{NH}_3$ gives another compound(x). This compound (x) on treatment with $\text{NaOCl/NaOH}$ gives a product, that on treatment with $\text{CHCl}_3\text{/KOH/}\Delta$ produces R-NC
In the light of the above statements, choose the correct answer from the options given below- Given below are two statements:
Statement I: Cross aldol condensation between two different aldehydes will always produce four different products.
Statement II: When semicarbazide reacts with a mixture of benzaldehyde and acetophenone under optimum pH, it forms a condensation product with acetophenone only.
In the light of the above statements, choose the correct answer from the options given below - $0.25 \text{ g}$ of an organic compound "A" containing carbon, hydrogen and oxygen was analysed using the combustion method. There was an increase in mass of $\text{CaCl}_2$ tube and potash tube at the end of the experiment. The amount was found to be $0.15 \text{ g}$ and $0.1837 \text{ g}$, respectively. The percentage of oxygen in compound A is ______ %. (Nearest integer)
(Given: molar mass in $\text{g mol}^{-1}$ $\text{H} : 1, \text{C} : 12, \text{O} : 16$)
