A shows positive Lassaigne's test for N and its molar mass is 121.
B gives effervescence with aqueous NaHCO3.
C gives fruity smell.
Identify A, B, and C from the following.
A shows positive Lassaigne's test for N and its molar mass is 121.
B gives effervescence with aqueous NaHCO3.
C gives fruity smell.
Identify A, B, and C from the following.
Show Hint
The Correct Option is A
Approach Solution - 1
To solve this problem, we need to identify the compounds A, B, and C based on the given chemical tests and reactions.
- Analyzing Compound A:
- Compound A shows a positive Lassaigne's test for nitrogen, indicating the presence of nitrogen in the compound.
- The molar mass of A is given as 121.
- Considering the options, Pyridine (C5H5N) is a compound with a molar mass of 79, which does not match. Amides and related structures are likely candidates.
- Methylamine (CH3NH2) has a molar mass of 31, not suitable. Benzamide (C7H7NO) has a molar mass of 121 and contains nitrogen, which matches the given data.
- Analyzing Compound B:
- Compound B gives effervescence with aqueous NaHCO3, indicating it is likely a carboxylic acid.
- Common acids like benzoic acid react with NaHCO3 to release CO2 gas, producing effervescence.
- Analyzing Compound C:
- Compound C gives a fruity smell, which is characteristic of esters.
- This suggests that an esterification reaction occurs between the carboxylic acid (Compound B) and an alcohol, forming an ester (Compound C).
Based on the analysis:
- A is Benzamide (C7H7NO)
- B is Benzoic Acid (C7H6O2)
- C is an Ester (e.g., ethyl benzoate, C9H10O2)
The correct answer corresponds to the option that lists Benzamide as A, Benzoic Acid as B, and an ester as C.
Approach Solution -2
Step 1: Analyzing A:
- A shows positive Lassaigne’s test for nitrogen (N), which means A contains nitrogen.
- The molar mass of A is 121 g/mol.
- Based on the structure options, the compound with a molecular formula that fits these criteria is \(\text{CONH}_2\) (amide group).
This is the structure of \(\text{benzamide}\), which fits the molar mass and the positive Lassaigne’s test for nitrogen.
Step 2: Analyzing B:
- B gives effervescence with aqueous NaHCO3.
This suggests B contains a carboxyl group (-COOH), as carboxylic acids react with NaHCO3 to release carbon dioxide (CO2).
- Therefore, B corresponds to a carboxylic acid group, specifically \(\text{CO}_2\text{H}\), which matches the second compound in the options.
Step 3: Analyzing C:
- C gives a fruity smell, which is characteristic of an ester group.
- The ester functional group in the options is \(\text{CO}_2\text{Et}\) (ethyl ester), which corresponds to the third structure in the options.
Step 4: Final Identification:
- A is \(\text{CONH}_2\) (benzamide), - B is \(\text{CO}_2\text{H}\) (carboxylic acid), - C is \(\text{CO}_2\text{Et}\) (ethyl ester). Thus, the correct answer is Option (1): A = CONH2, B = CO2H, C = CO2Et
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