PYQSidePowered by
ExamsMy practice
A compound (x) with molar mass 108 g mol-1 undergoes acetylation to give product with molar mass 192 g mol-1. The number of amino groups in the compound (x) is .
2
R-NH2 + CH3COCl R-NH-COCH3 + HCl
∵ H (1) is replaced by COCH3 (43) ⇒ gain per -NH2 = 42
Total gain = 192 − 108 = 84
∴ Number of -NH2 groups = 8442 = 2
(e.g. x = benzene-1,4-diamine, C6H8N2 = 108)
Answer: 2
The final product A, formed in the following multistep reaction sequence is : [figure]
Following is a confirmatory test for aromatic primary amines. Identify reagent (A) and (B). [figure]
The products A and B formed in the following reaction scheme are respectively [figure]
The arenium ion which is not involved in the bromination of Aniline is .
The product A formed in the following reaction is [figure]
Identify B formed in the reaction. Cl-(CH2)4-Cl excess NH3 A NaOH B + H2O + NaCl
9.3 g of aniline is subjected to reaction with excess of acetic anhydride to prepare acetanilide. The mass of acetanilide produced if the reaction is 100% completed is 10-1 g. (Given molar mass in g mol-1 N : 14, O : 16, C : 12, H : 1)