Amines Test

Result

Amines Test - 31

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Weekly Quiz Competition

Question 1
1 / -0

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

A
$$CH_3CH_2N\equiv N\}^{\oplus}Cl^-$$

B
$$CH_3-C(CH_3)_2-N\equiv N\}^{\oplus} Cl^-$$

C
$$CH_3-N\equiv N\}^{\oplus}Cl^-$$

D
$$(CH_3)_3C-N\equiv N\}^{\oplus}Cl^-$$
Question 2
1 / -0

For the diazonium ions the order of reactivity towards diazo-coupling with phenol in the presence of dilute $$NaOH$$ is:

A
I $$<$$ IV $$<$$ II $$<$$ III

B
I $$<$$ III $$<$$ IV $$<$$ II

C
III $$<$$ I $$<$$ II $$<$$ IV

D
III $$<$$ I $$<$$ IV $$<$$ II

Solution

The order of reacting towards diazo coupling with phenol in the presence of dilute $$NaOH$$ of these diazonium ions is :-
Question 3
1 / -0

Which of the following statement is not true?

A
$$CH_3CH_2NH_2$$ is ethanamine

B
$$CH_2CH_2OH$$ is an ether

C
Cyclopentane and 2-pentene have a molecular formula of $$C_5H_{10}$$

D
Alkenes an alkynes are unsaturated

Solution

$$C{H}_{3}C{H}_{2}N{H}_{2}$$ is Ethanamine or Ethylamine
$$C{H}_{2}C{H}_{2}OH$$ is an alcohol and not an ester.
Cyclopentane and 2-pentene have Molecular formula $${C}_{5}{H}_{10}$$
Alkenes and Alkynes are Unsaturated Compounds.
So, Option B is correct
Question 4
1 / -0

Diazotization of n-Bu-$$NH_2$$ with $$NaNO_2/HCl$$ gives _________ isomeric butene.

A
$$2$$

B
$$3$$

C
$$4$$

D
$$5$$

Solution

So total 3 products are possible for diazotisation on n-Butane.
Question 5
1 / -0

What product is formed on heating two molecules of urea?

A
Uric Acid

B
Biuret

C
Nitrogen

D
Carbon dioxide

Solution

Urea is $$NH_2-\overset{\overset{O}{||}}{C}-NH_2$$
When $$2$$ molecules of urea is heated, biuret is formed.
$$2NH_2-\overset{\overset{O}{||}}{C}-NH_2 \longrightarrow NH_2-\overset{\overset{O}{||}}{C}-NH-\overset{\overset{O}{||}}{C}-NH_2$$
Biuret
Question 6
1 / -0

The most basic among the following is:

A
$${ H }_{ 3 }C-{ NH }_{ 2 }$$

B
$${ CH }_{ 3 }-{ CH }_{ 2 }-NH_2$$

C
$${ H }_{ 3 }C-NH-{ CH }_{ 3 }$$

D
$${ H }_{ 3 }C-{ CH }(CH_3)-NH_2$$

Solution

$${ H }_{ 3 }-C$$$$\rightarrow -NH\leftarrow -C-{ H }_{ 3 }$$
$$+I$$ effects of methyl group
Here, also methyl group attached with the N-atom. The inductive effect of methyl group increases the density of electron on N-atom. It becomes more basic.
Question 7
1 / -0

Which is most volatile?

A
$${ CH }_{ 3 }{ CH }_{ 2 }{ CH }_{ 2 }{ NH }_{ 2 }$$

B
$${ \left( { CH }_{ 3 } \right) }_{ 3 }N$$

C

D
$${ CH }_{ 3 }OH$$

Solution

$$CH_3-OH$$ is more volatile. Volatility is due to the tendency to evaporate. The tendency of volatility of $$CH_3-OH$$ is low. Dipole attraction and London force occurs in the molecules.
Question 8
1 / -0

Compare the boiling point of the following two amines.

A
Boiling point of $$I > II$$

B
Boiling point of $$II > I$$

C
Both should have equal boiling points

D
It can't be predicted

Solution
Question 9
1 / -0

Which is most basic in aqueous solution?

A
$${ CH }_{ 3 }-{ NH }_{ 2 }$$

B
$${ (CH }_{ 3 }{ ) }_{ 2 }{ NH }$$

C
$${ (CH }_{ 3 }{ ) }_{ 3 }N$$

D
$$ph-{ NH }_{ 2 }$$

Solution

$${ CH }_{ 3 }\rightarrow \begin{matrix} N \\ \uparrow \\ { CH }_{ 3 } \end{matrix}\leftarrow { CH }_{ 3 }$$
$$+I $$ effects of Three methyl group

Here, it is 3 amine and three methyl group attached with N-atom. The inductive effect of three methyl group and lypez conjugation effect of $$9-\alpha -H$$ atom, So this is more stable and basic in nature.
Question 10
1 / -0

Which of the following is most basic ?

A

B

C

D

Solution

Here, lone pair of electrons are available on the $$N-$$ atom and it can easily donate electrons and $$pK_b$$ value is also low.