Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 57

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Weekly Quiz Competition

Question 1
1 / -0

Industrially, $${H}_{2}{O}_{2}$$ is obtained by the given cyclic process. Which one of the following properties is wrong about the mixture of organic solvents in which the reaction is carried out?
$$2-\text {Ethylanthraquinol} \underset{H_2/Pd}{\overset{O_2}{\rightleftharpoons} } 2 - \text {Ethylanthraquinone}+H_2O_2$$

A
It must be resist oxidation

B
It must be miscible with water

C
It must dissolve both (P) and (Q)

D
It is generally a mixture of ester and hydrocarbon

Solution

The organic solvent used should not be miscible with water because hydrogen peroxide $$(H_2O_2)$$ formed is miscible in water which makes them difficult to separate the organic solvent and hydrogen peroxide.
Question 2
1 / -0

II.$${ CH }_{ 2 }=CHCOOH\xrightarrow {\triangle} { CH }_{ 2 }={ CH }_{ 2 }$$

III. $$CH_3CH(COOH)_2 \xrightarrow{\triangle} CH_3 CH_2COOH$$

Consider the above given reactions,
In which of the cases, parent compound loses its functional group in preference :

A
$$I,II$$

B
$$I,II,III$$

C
$$II,III$$

D
$$I,III$$

Solution

$$CH_2=CHCOOH \rightarrow CH_2=CH_2$$ :-looses its preference.

$$CH_3−CH(COOH)_2 \rightarrow CH_3CH_2COOH$$ :- $$-COOH$$ does not loses its preference.
Question 3
1 / -0

If a mixture of methane, ammonia and oxygen is passed over pt-gauge at $$700^\circ {\text{C}}$$ then the product will be:

A
HCOOH

B
HCN

C
$${\text{C}}{{\text{H}}_{\text{3}}}{\text{N}}{{\text{H}}_{\text{2}}}$$

D
All of these

Solution

If a mixture of methane, ammonia and oxygen is passed over pt-gauge at $$700^\circ {\text{C}}$$ then the product will be HCN.
Question 4
1 / -0

1- Bromo-3-chlorocyclobutane is treated with two equivalents of Na, in the presence of ether. Which of the following compounds will be formed?

A

B

C

D

Solution

Since alkyl bromides are more reactive than alkyl chlorides, therefore, intramolecular Wurtz reaction occurs on the side of $$Br$$ atom.
Question 5
1 / -0

The given compound on reaction with alc. $$KOH$$ gives:

A

B

C

D
Question 6
1 / -0

Complete each synthesis by giving releasing starting material, reagent on products.

A

B

C

D

E

Solution
Question 7
1 / -0

Which of the following compound is most stable?

A

B

C

D

Solution

$$\therefore$$ (A) is most stable.
Question 8
1 / -0

Which of the following is pair of homologues?

A
$${\text{C}}{{\text{H}}_{\text{3}}}{\text{OH,}}\,{\text{C}}{{\text{H}}_{\text{3}}} - {\text{O}} - {\text{C}}{{\text{H}}_3}$$

B
$${\text{C}}{{\text{H}}_{\text{3}}}{\text{OH,}}\,{\text{C}}{{\text{H}}_{\text{3}}}{\text{SH}}$$

C
$${\text{C}}{{\text{H}}_{\text{3}}} - {\text{O}} - {\text{C}}{{\text{H}}_{\text{3}}},{\text{C}}{{\text{H}}_{\text{3}}} - {\text{C}}{{\text{H}}_{\text{2}}} - {\text{OH}}$$

D
$${\text{C}}{{\text{H}}_{\text{3}}}{\text{OH,}}\,{\text{C}}{{\text{H}}_3}{\text{C}}{{\text{H}}_2}{\text{OH}}$$

Solution

A homologous series is a series of compounds with the same functional group and similar chemical properties in which each successive member differs by $${\text{C}}{{\text{H}}_{\text{2}}}$$.
Hence, $$D$$ is the correct option.
Question 9
1 / -0

In which of the following reaction, Markownikoff's rule is violated ?

A
$$CH_3-O-CH=CH_2\xrightarrow[CCl_4]{HBr}$$

B
$$CH_3-NH-CH=CH_2\xrightarrow[CCl_4]{HBr}$$

C
$$CH_3-S-CH=CH_2\xrightarrow[CCl_4]{HBr}$$

D
$$O_2N-CH=CH_2\xrightarrow[CCl_4]{HBr}$$

Solution

Since a electron withdrawing group is present here, it doesn't follow Markovnikov's Rule.

$$O_2N-CH=CH_2\overset {Hbr}{\underset {CCl_4}{\longrightarrow}} O_2N-CH_2-CH_2-Br$$

Since, $$-NO_2$$ group destabilises the carbocation.
Question 10
1 / -0

How many different functional groups are present in given compound?

A
3

B
4

C
1

D
5
Solution
In the given compound, there are total of 4 different functional groups :
Alcohol $$(-OH)$$
Aldehyde $$(R-CHO)$$
Ketone $$(R-CO-R)$$
Carboxylic Acid $$(-COOH)$$
Thus, option B is correct.