Amines Test

Result

Amines Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following diazonium salt is relatively stable at $$0-{ 5^0 }^{ }C$$?

A
$${ CH }_{ 3 }-N\equiv N{ \} }^{ \oplus }C{ l }^{ - }$$

B
$${ \left( { CH }_{ 3 } \right) }_{ 2 }CH-N\equiv N{ \} }^{ \oplus }{ Cl }^{ - }$$

C
$${ C }_{ 6 }{ H }_{ 5 }-N\equiv N{ \} }^{ \oplus }{ Cl }^{ - }$$

D
$${ \left( { CH }_{ 3 } \right) }_{ 3 }C-N\equiv N{ \} }^{ \oplus }{ Cl }^{ - }$$

Solution

The $$+I$$ effect which stabilizes the $${ N }^{ + }$$ion is in the following order $${ C }_{ 6 }{ H }_{ 5 }-<{ CH }_{ 3 }-<{ \left( { CH }_{ 3 } \right) }_{ 2 }-<{ \left( { CH }_{ 3 } \right) }_{ 3 }$$
$$\therefore $$ The $${ \left\{ { \left( { CH }_{ 3 } \right) }_{ 3 }C-N\equiv N \right\} }^{ + }{ Cl }^{ - }$$ is most stable
Question 2
1 / -0

Select the basic strength order of following molecules.

A
$$III > II > I$$

B
$$II > III > I$$

C
$$I > III > II$$

D
$$III > I > II$$

Solution

Since in (III) lone pair is only involved in delocalisation, in (II) nitrogen is attached to the carbonyl (withdrawing group) and one alkyne group (donating group+I effect) which have the more basic character them the (I) in which (N) is attached to the two group i.e benzene and carbonyl.
Question 3
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Which of the following conditions is most suitable for the above reaction?

A
strongly acidic

B
strongly alkaline

C
Slightly alkaine

D
neutral

Solution

In this reaction, primary aromatic amine is treated with nitrous acid ($${ HNO }_{ 2 }$$). $${ HNO }_{ 2 }$$ can be obtained by dissolving solid $${ NaNO }_{ 2 }$$ in aqueous acidic solution.
Question 4
1 / -0

$$H-COOH > Ph-COOH > CH_{3}-COOH$$ (acidic nature)$$CF_{3}-COOH > CCI_{3}-COOH > CH_{2}-COOH$$ (Acidic nature)$$N- methylmethanamine > methanamine > N, N- dimethylmethanamine $$ (Basic nature in aqueous phase)$$N,N- diethlethanamine > N-ethylethanamine > Ethanamine $$ (Basic nature in aqueous phase)Then the correct order is:

A
$$i,ii,iv$$

B
$$ii,iii,iv$$

C
$$i,ii,iii$$

D
$$i,ii,iii,iv$$

Solution

In aqueous phase, the basicity of amines depends upon:
$$(i)$$ Inductive effect: which fovours tertiary amine to be more basic due to greater $$+I$$ effect of $$3$$alkyl group directly attached to nitrogen.
$$(ii)$$ Solution Effect: Which favours primary amine to be more basic due to greater solution of its cation.
$$(iii)$$ Steric Factor: Which cause tertiary amine to be less basic due to steric hinderance .
Question 5
1 / -0

Decreasing order of basicity of the three isomers of nitro aniline is:

A
$$p-nitroaniline> o-nitroaniline> m-nitroaniline$$

B
$$p-nitroaniline> m-nitroaniline> o-nitroaniline$$

C
$$m-nitroaniline> p-nitroaniline> o-nitroaniline$$

D
$$m-nitroaniline> o-nitroaniline> p-nitroaniline$$

Solution

Nitro group is an electron-withdrawing group. It mainly withdraws electrons from the ortho and para positions. Therefore para isomer is less basic than meta isomer.

Ortho substituted anilines are generally weaker bases than aniline irrespective of the electron releasing or electron-withdrawing nature of the substituent.

Hence decreasing order of basicity of the isomers of nitroaniline:
$$m-nitroaniline>p-nitroaniline>o-nitroaniline$$
Question 6
1 / -0

The order of basic strength of the given basic nitrogen atoms is :

A
$$III > II > I > IV$$

B
$$III > I > II > IV$$

C
$$I > III > II > IV$$

D
$$II > III > I > IV$$

Solution

Since $$(II)$$ is more basic then $$(III)$$ due $$(II)$$ nitrogen get negative charge due resonance hence it is more basic.
There for correct order is $$II$$>$$III$$>$$I$$>$$IV$$
D)
Question 7
1 / -0

What is the major organic product of the following reaction?
$$ { CH }_{ 3 }{ CH }_{ 2 }{ NHCH }_{ 2 }{ CH }_{ 3 }\longrightarrow $$?

A

B

C

D

E

Solution
Question 8
1 / -0

The correct sequence regarding base strength of aliphatic amines in aqueous solution is:

A
$${R}_{3}N> {R}_{2}NH> R{NH}_{2}> {NH}_{3}$$

B
$${R}_{2}NH> R{NH}_{2}> {R}_{3}N> {NH}_{3}$$

C
$${R}_{2}NH> {R}_{3}N> R{NH}_{2}> {NH}_{3}$$

D
$$R{NH}_{2}> {R}_{2}NH> {R}_{3}N> {NH}_{3}$$

Solution

Since the bascities of amine depend upon the no of alkyl group directly attached to the nitrogen directly due to $$+I$$ effect to alkyl group increased the bascities of amine.
Question 9
1 / -0

Which of the following will accept $$H^{+}$$ from $$NH_{4}^{+}$$ ion?

A

B

C

D
$$CH_{3}-CH_{2}-NH_{2}$$

Solution

Since the aromatic amines (aniline) are less basic than aliphatic amines.
Because lone pair of nitrogen in aromatic amines are involved in resonance.
Question 10
1 / -0

Which of the following Statements is/are correct?

A
$$(SiH_3)_3N $$ is weaker base than $$(CH_3)_3N$$.

B
Amongst $$Cl-Cl$$, $$N-F$$,$$C-F$$ And $$O-F$$ bond is most polar

C
$$OF_2$$ has higher dipole moment than $$H_2O$$

D
An alchohol is less volatile than other having same molecular formula on account of intermolecular hydrogen bonding

Solution

$$A.$$ $${(SiH_3)}_3N$$ is a weaker base than $${(CH_3)}_3N$$.
In $${(CH_3)}_3N$$ the lone pair is concentrated on the $$N-atom$$. But in case of Trisillyl amine, the lone pair on nitrogen gets delocalised on the $$3$$ silicon atoms bonded to it.
Since, base strength is a measure of tendency to donate lone pair, trimethylamine is stranger base.

$$D.$$ In ethers there is no intermolecular hydrogen bond, where as in alcohol, intermolecular hydrogen bond is present which makes them less volatile and have high boiling point.