Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 48

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Weekly Quiz Competition

Question 1
1 / -0

Find the major product when the above compound is made to react with the following reagent.

$$+Br_{ 2 }\quad \overset { hv }{ \underset { 298\quad K }{ \longrightarrow } } $$ (major).

A

B

C

D

Solution

$$3^o$$ free radial more stable.
So,Major product is option is B
Question 2
1 / -0

Which of the following pairs is correctly matched?

A
amino acid alanine ; opticallt active

B

C

D

Solution

amino acid alanine is optically active
Question 3
1 / -0

The correct IUPAC name of the compound $$(CH_3CH_2)_2NCH_3$$ is:

A
N - Ethyl-N-methyl ethanamine

B
N, N-Diethylethanamine

C
N-methylethanamine

D
N-ethylethanamine

Solution

$$(CH_3CH_2)_2NCH_3$$ it is a tertiary amine, and the parent chain is ethanamine.
IUPAC name is N - Ethyl - N- methyl ethanamine.
Question 4
1 / -0

The presence of a carboxyl group in a compound can be detected using:

A
2,4-dinitro phenyl hydrazine

B
neutral $$FeCl_3$$

C
$$NaHCO_3$$

D
$$CHCl_3$$

Solution

$$O$$
$$-\overset {||}{C}-O^{\circleddash}$$ carboxyl group in a compound can be detected by treating it with $$NaHCO_3$$. On reaction with $$NaHCO_3$$, $$CO_2$$ gas is evolved which turns lime water milky.
Question 5
1 / -0

A canonical structure will be more stable if

A
it includes cyclic delocalization of $$(4n+2)$$ $$\pi-$$ electrons than if it involves acyclic delocalization of $$(4n+2)$$ $$\pi-$$ electrons.

B
it includes cyclic delocalization $$(4n)$$ $$\pi-$$ electrons than if it involves acyclic delocalization of $$(4n)$$ $$\pi-$$ electrons

C
positive charge is on more electronegative atom than if positive charge is on less electronegative atom provided atoms are in same period.

D
negative charge is on more electronegative atom than if negative charge is on less electronegative atom provided atoms are in same period.

Solution

A canonical structure will be more stable of i)negative charge is on more electronegative atom and positive charge on more electropositive atom.
ii)If it increases cyclic delocalisation of $$(4n+2)\pi$$ electrons than if it involves acyclic delocalisation of $$(4n+2)\pi$$ electrons.
A is the correct answer.
Question 6
1 / -0

What is 'A' in the above reaction?

A

B

C

D

Solution

First protonation occur then rearrangement of carbocation to form more stable carbocation then $$Cl^-$$ get attack.
C is the correct answer.
Question 7
1 / -0

No of $$\pi$$ electrons in cyclobutadienyl anion $${({C}_{4}{H}_{4})}^{-2}$$ is

A
2

B
4

C
6

D
8

Solution

Number of $$\pi$$ bond in cyclobutadienyl ion is 1 and number of $$\pi$$ electrons is 2 elecrons.
Question 8
1 / -0

Silver benzoate reacts with bromine to give:

A
$${ C }_{ 6 }{ H }_{ 6 }$$

B
$${ C }_{ 6 }{ H }_{ 5 }COOBr$$

C
$${ m }-Br-{ C }_{ 6 }{ H }_{ 4 }-COOAg$$

D
$${ C }_{ 6 }{ H }_{ 5 }Br$$

Solution

d is the correct option because it correctly shows the product formed
Question 9
1 / -0

Find the A

A

B

C

D

Solution