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50
Subjective

Arrange the following compounds in increasing order of dipole moment.

$$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_3, \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{NH}_2, \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}$$

Explanation

Dipole moment of amine, alcohol and hydrocarbon can be explained on the basis of bond polarity of $\mathrm{C}-\mathrm{H}, \mathrm{N}-\mathrm{H}$ and $\mathrm{O}-\mathrm{H}$ bond. As the bond polarity increase, dipole moment increases $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_3<\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{NH}_2<\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}$

51
Subjective

What is the structure and IUPAC name of the compound, allyl amine?

Explanation

Structural formula of allyl amine is as follows

52
Subjective

Write down the IUPAC name of

Explanation

During naming of N-substituted amine, substituted group present at N are added as suffix on N-alkyl in IUPAC nomenclature.

53
Subjective

A compound Z with molecular formula $\mathrm{C}_3 \mathrm{H}_9 \mathrm{~N}$ reacts with $\mathrm{C}_6 \mathrm{H}_5 \mathrm{SO}_2 \mathrm{Cl}$ to give a solid, insoluble in alkali. Identify Z.

Explanation

$\mathrm{Z}\left(\mathrm{C}_3 \mathrm{H}_9 \mathrm{~N}\right)$ is an aliphatic amine. On reaction with $\mathrm{C}_6 \mathrm{H}_5 \mathrm{SO}_2 \mathrm{Cl}$ (Hinsberg's reagent), it gives a product insoluble in alkali. It means that the product does not have a replaceable H -atom attached to the N - atom. So, compound Z is a secondary amine (ethyl methyl amine).

54
Subjective

A primary amine, $\mathrm{RNH}_2$ can be reacted with $\mathrm{CH}_3-\mathrm{X}$ to get secondary amine, $\mathrm{R}-\mathrm{NHCH}_3$ but the only disadvantage is that $3^{\circ}$ amine and quaternary ammonium salts are also obtained as side products. Can you suggest a method where $\mathrm{RNH}_2$ forms only $2^{\circ}$ amine?

Explanation

$$\mathrm{\mathop {RN{H_2}}\limits_{\Pr imary\,a\min e} \mathrel{\mathop{\kern0pt\longrightarrow} \limits_{Carbyla\min e\,reaction}^{KOH/CHC{l_3}}} \mathop {RNC}\limits_{Alkyl\,Iso\,cyanide} \buildrel {{H_2}/Pd} \over \longrightarrow \mathop {RNHC{H_3}}\limits_{Secondary\,a\min e}}$$

Primary amines show carbylamine reaction in which two H -atoms attached to N -atoms of $\mathrm{NH}_2$ are replaced by one C-atom. On catalytic reduction, isocyanide (formed) produces secondary amine and not tertiary or quaternary salts.