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Practice Test 11

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Among the following amines, which one has the highest pK_b value in aqueous solution?

Methanamine
N,N-Dimethylaniline
Ethanamine
Benzenamine

Solution

Weak base has high pk_b value. Benzenamine (aniline)is the weakest base among the given amines. Therefore it has highest pk_b value.

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Solution

Ethanoic acid on heating with ammonia forms compound A which on treatment with bromine and sodium hydroxide gives compound B. Compound B on treatment with NaNO₂/dil.HCl gives compound C. The compounds A, Band C respectively are

ethanamide,methanamine, methanol
propanamide,ethanamine, ethanol
N-ethylpropanamide, methaneisonitrile, methanamine
ethanamine, bromoethane, ethanedia-zonium chloride(e)methanamine, ethanamide,methanol