Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 73

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Weekly Quiz Competition

Question 1
1 / -0

In the following reactions, the compound E is:

A
$$CO$$

B
$$CH_4$$

C
$$H_2$$

D
$$C_2H_2$$

Solution
Question 2
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Which types of mechanism take place in sec.halides $$ (CH_3)_2 CH-X? $$

A
$$ S_N 1 $$

B
$$ S_N2 $$

C
Both $$S_N1$$ & $$S_N2$$

D
None of these

Solution

Secondary halides undergo nucleophilic reaction through both mechanism.
Hence, Option "C" is the correct answer.
Question 3
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Molecular mass of a volatile organic solid can be determined by :

A
Silver salt method

B
Platinichloride method

C
Victor Meyer's method

D
Kjeldahl's method

Solution

$$\text{The molecular mass of a volatile organic solid can be determined by }Victor Meyer’s \ method.$$
In Victor Meyer’s method a known mass of a volatile liquid or solid is converted into its vapour by heating in a Victor-Meyer's tube. The vapour displaces its own volume of air. The volume of air displaced by the vapour is measured at the experimental temperature and pressure. The volume of the vapour at s.t.p is then calculated. From this, the mass of $$2.24\times10^{−2}m^3$$ of the vapour at S.T.P. is calculated. This value represents the molecular mass of the substance.

Option C is correct.
Question 4
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Select the correct priority for citation as principal group

A

B

C

D

Solution

$$\text{According to IUPAC convention, Carboxylic Acids and their derivatives have the highest priority then carbonyls}$$ $$\text{then alcohols, amines, alkenes, alkynes, and alkanes, so in this case the correct answer is the correct answer is D}$$
Question 5
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Directions For Questions

A compound $$(A)$$ called vanillin is isolated from vanilla seeds. Molecular formula of vanillin is $$C_{8}H_{8}O_{3}$$, Vanillin gives violet colour on treatment with neutral $$FeCI_{3}$$. It also gives a silver mirror with Tollens' reagent. Each mole of vanillin gives one mole of $$AgI$$ when subjected to Zeisel's active methoxy estimation.
$$Vanillin \xrightarrow {Conc. HBr} compound (B)$$;
Compound $$(B)$$ can also be obtained from catechol by Gattermann-Koch reaction.
Answer the following questions :

...view full instructions

Which of the following functional groups is not present in vanillin?

A
$$-COOH$$

B
$$-CHO$$

C
$$-OH$$

D
$$-OCH_{3}$$

Solution

Option A is the answer.
Question 6
1 / -0

In the case homologous series of alkanes, which one of the following statements is incorrect?

A
The members of the series are isomers of each other

B
The members of the series have similar chemical properties

C
The members of the series have the general formula $$C_nH_{2n + 2}$$ ,where n is an integer

D
The difference between any two successive members of the series corresponds to $$14$$ unit of relative atomic mass

Solution

The difference between any two successive members of the homologous series $$-CH_2 -$$ i.e., the molecular weight of every two adjacent members differ by $$14$$.
Question 7
1 / -0

Which of the following has $$p\pi -d\pi$$ bonding?

A
$$NO_3^{-}$$

B
$$CO_3^{-2}$$

C
$$BO_3^{-3}$$

D
$$SO_3^{-2}$$

Solution

ANSWER is Option $$D$$ $$SO_3^{2−}$$
$$dπ-pπ$$ back bonding involves d-orbitals. Hence it is possible only in case of elements which belong to the 3rd period, where d-orbitals are present (though unoccupied in ground state). Out of all the options, only $$SO_3^{2−}$$ can have dπ-pπ back bonding because sulphur belongs to the 3rd period.
Question 8
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Directions For Questions

A compound $$(A)$$ called vanillin is isolated from vanilla seeds. Molecular formula of vanillin is $$C_{8}H_{8}O_{3}$$, Vanillin gives violet colour on treatment with neutral $$FeCI_{3}$$. It also gives a silver mirror with Tollens' reagent. Each mole of vanillin gives one mole of $$AgI$$ when subjected to Zeisel's active methoxy estimation.
$$Vanillin \xrightarrow {Conc. HBr} compound (B)$$;
Compound $$(B)$$ can also be obtained from catechol by Gattermann-Koch reaction.
Answer the following questions :

...view full instructions

Vanillin contains.

A
$$-Cl$$

B
$$-CONH_{2}$$

C
$$-CHO$$

D
$$-COOH$$

Solution

Vanillin is an organic compound with the molecular formula $$C_8H_8O_3$$. It is a phenolic aldehyde. Its functional groups include aldehyde, hydroxyl, and ether. Vanillin contains $$-CHO$$ group.

Option B is correct.
Question 9
1 / -0

A distinctive and characteristic functional group of fats is

A
An ester group

B
A peptide group

C
A ketonic group

D
An alcoholic group

Solution

$$\text{Fats are the basically Higher order Ester}$$ which are formed by by the combination of higher acids and alcohol.
thus, Ester group is the distinctive and characterstic group of fats.
Question 10
1 / -0

Directions For Questions

A compound $$(A)$$ called vanillin is isolated from vanilla seeds. Molecular formula of vanillin is $$C_{8}H_{8}O_{3}$$, Vanillin gives violet colour on treatment with neutral $$FeCI_{3}$$. It also gives a silver mirror with Tollens' reagent. Each mole of vanillin gives one mole of $$AgI$$ when subjected to Zeisel's active methoxy estimation.
$$Vanillin \xrightarrow {Conc. HBr} compound (B)$$;
Compound $$(B)$$ can also be obtained from catechol by Gattermann-Koch reaction.
Answer the following questions :

...view full instructions

Vanillin contains:

A
A phenolic group

B
An alcoholic group

C
Both phenolic and alcoholic groups

D
Two phenolic groups

Solution

Vanillin is an organic compound with the molecular formula $$C_8H_8O_3$$. It is a phenolic aldehyde. Its functional groups include aldehyde, hydroxyl, and ether. Vanillin contains $$phenolic \ group$$ not alcoholic.

Option A is correct.