Problem 134
The \(\mathrm{pK}_{a}\) of the carboxyl group in valine, \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}\) \(\mathrm{CH} \mathrm{NH}_{2} \mathrm{COOH}\) is \(2.31\) and \(\mathrm{pK}_{\mathrm{a}}\) for the amino group of the acid is \(9.69 .\) The isoelectric point of the valine is
Problem 137
The total number of isomers which are primary amines with a molecular formula \(\mathrm{C}_{4} \mathrm{H}_{7} \mathrm{~N}\), having no \(\mathrm{C} \equiv \mathrm{C}\) bond is
Problem 138
How many of the following amines can be used for the symmetrical cleavage of diborane? \(\mathrm{CH}_{3} \mathrm{NH}_{2},\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH},\left(\mathrm{C}_{2} \mathrm{H}_{3}\right)_{3} \mathrm{~N},\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N},\left(\mathrm{C}_{2} \mathrm{H}_{3}\right)_{2} \mathrm{NH}\), \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{NH}_{2}, \mathrm{C}_{5} \mathrm{H}_{5} \mathrm{~N}\), (i \(\left.-\mathrm{Pr}\right)_{3} \mathrm{~N}\), quinuclidine
Problem 140
On heating benzyl amine with chloroform and ethanolic KOH, the product obtained is (a) benzyl alcohol (b) benzaldehyde (c) benzonitrile (d) benzyl isocyanide
Problem 141
A substance forms zwitter ion. It can have functional groups \([2002]\) (a) \(-\mathrm{NH}_{2},-\mathrm{COOH}\) (b) \(-\mathrm{NH}_{2},-\mathrm{SO}_{3} \mathrm{H}\) (c) both (d) none of these
Problem 142
In an organic compound of molar mass is \(108 \mathrm{~g} \mathrm{~mol}^{-1}\). \(\mathrm{C}, \mathrm{H}\) and \(\mathrm{N}\) atoms are present in \(9: 1: 35\) by weight in it. Molecular formula can be (a) \(\mathrm{C}_{6} \mathrm{H}_{8} \mathrm{~N}_{2}\) (b) \(\mathrm{C}_{7} \mathrm{H}_{10} \mathrm{~N}\) (c) \(\mathrm{C}_{5} \mathrm{H}_{6} \mathrm{~N}_{3}\) (d) \(\mathrm{C}_{4} \mathrm{H}_{18} \mathrm{~N}_{3}\)
Problem 143
When a primary amine reacts with chloroform in ethanolic KOH, the product formed is (a) an aldehyde (b) an alcohol (c) a cyanide (d) an isocyanide
Problem 144
Ethyl isocyanide on hydrolysis in acidic medium generates [2003] (a) ethylamine salt and methanoic acid (b) propanoic acid and ammonium salt (c) ethanoic acid and ammonium salt (d) methylamine salt and ethanoic acid
Problem 145
The correct order of increasing basic nature for the bases \(\mathrm{NH}_{3}, \mathrm{CH}_{3} \mathrm{NH}_{2}\), and \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}\) is \([\mathbf{2 0 0 3}]\) (a) \(\mathrm{NH}_{3}<\mathrm{CH}_{3} \mathrm{NH}_{2}<\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}\) (b) \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}<\mathrm{NH}_{3}<\mathrm{CH}_{3} \mathrm{NH}_{2}\) (c) \(\mathrm{CH}_{3} \mathrm{NH}_{2}<\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}<\mathrm{NH}_{3}\) (d) \(\mathrm{CH}_{3} \mathrm{NH}_{2}<\mathrm{NH}_{3}<\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}\)
Problem 146
Amongst the following, the most basic compound is [2004] (a) benzylamine (b) aniline (c) acetanilide (d) p-nitroaniline
