Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 45

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Weekly Quiz Competition

Question 1
1 / -0

Consider the reactions
(i) $$(CH_3)_2CH - CH_2Br$$
$$\xrightarrow{C_2H_3OH}(CH_3)_2CH - CH_2OC_2H_5 +HBr$$
(ii) $$(CH_3)_2CH - CH_2Br$$
$$\xrightarrow{C_2H_3O^-}(CH_3)_2CH - CH_2OC_2H_5 +HBr$$
The mechanisms of reactions(i) and (ii) are respectively.

A
$$S_{N}2$$ and $$S_{N}2$$

B
$$S_{N}2$$ and $$S_{N}1$$

C
$$S_{N}1$$ and $$S_{N}2$$

D
$$S_{N}1$$ and $$S_{N}1$$

Solution

(i) $$(CH_3)_2CH-CH_2Br \xrightarrow []{C_2H_3OH}(CH_3)_2CH-CH_2OC_2H_5+HBr$$
(Refer to Image 1)

(ii) $$(CH_3)_2CH-CH_2Br \xrightarrow []{C_2H_5O^{\circleddash}} (CH_3)_2CH-CH_2O-C_2H_5$$
(Refer to Image 2)
Question 2
1 / -0

Give $$ IUPAC $$ names of following alkyl group.

A
Isopentyl

B
Tert-Pentyl

C
Isobutyl

D
Neohexyl

Solution
Question 3
1 / -0

$$IUPAC$$ name of the hydrocarbon $$(A)$$ is:

A
$$2-$$ethyl$$-5-$$methylhexane

B
$$5-$$ethyl$$-2-$$methylhexane

C
$$2,5-$$dimethylheptane

D
$$5-$$ethyl$$2,5-$$methylhexane

Solution

The IUPAC name is :- $$2,5-dimethyl$$ $$heptane$$.
Question 4
1 / -0

Based on "$$1993$$ Recommendations" $$H_2C=CHCH_2CH_2CH_3$$ is named as:

A
$$1$$-pentene

B
pent-$$1$$-ene

C
$$4-$$ pentene

D
Pent$$-4-$$ ene

Solution

$$\underset { 1 }{ { H }_{ 2 }C } =\underset { 2 }{ CH } \underset { 3 }{ { CH }_{ 2 } } \underset { 4 }{ { CH }_{ 2 } } \underset { 5 }{ { CH }_{ 3 } } $$
$$1-$$pentene position of the functional group
should be mention before the main carbon chain name.
Question 5
1 / -0

Which of the following substrate is most reactive towards methoxide ion ($$Me=\overset{\ominus}{O}$$)?

A
$$ CH_{3} - I $$

B

C
$$ CH_{3} - O-SO_{2}-CF_{3} $$

D
$$ CH_{3} - F $$

Solution

Solution:- (C)
The substrate which has the best leaving group, i.e., the weakest base will be most reactive.
$$C{H}_{3}-O-S{O}_{2}-C{F}_{3}$$ is most reactive substrate because it has weakest base $$\left( -O-S{O}_{2}-C{F}_{3} \right)$$ group.
Question 6
1 / -0

IUPAC name of the formula $$CH_2(COOH)_2$$ is ?

A
butanoic acid

B
propane -1,3-dioic acid

C
propane -1,2-dioic acid

D
malonic acid

Solution
Question 7
1 / -0

Question

A

B

C

D
Question 8
1 / -0

A number of functional group and degree of unsaturation (respectively) in the above compounds is:

A
$$7,8$$

B
$$6,8$$

C
$$6,6$$

D
$$5,6$$

Solution

Function Groups are:
$$O$$ $$O$$
$$-\overset {||}{C}-NH-$$ , $$-\overset {||}{C}-NH_2$$, $$-COOH$$, $$-O-$$, $$-NH-$$, $$-C\equiv CH$$ .
Hence, only $$6$$ functional groups.
Degree of unsaturation is $$8$$ ($$3$$ Rings+ $$3$$ Double bonds+ $$1$$ Triple bond)
Question 9
1 / -0

Compound $$(A)$$ is:

A

B

C

D
Question 10
1 / -0

Which of the following molecules contains only $$\pi$$ bond?

A
$$B_2$$

B
$$C_2$$

C
$$C_2H_2$$

D
Both (1) & (2)

Solution

There can be exclusive pi bonds without existing sigma bonds. Some such molecules are $$B_2$$ and $$C_2$$.
$$MO$$ Theory shows that there are two sets of paired electrons in a degenerate pi bonding set of orbitals.
The paired electrons belong to the pi orbitals ($$\pi$$ $$2px$$ and $$\pi 2py$$ to be precise). It is these paired electrons that are involved in bonding while the rest of the inner shell electrons aren’t.