Alcohols Phenols and Ethers Test

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Alcohols Phenols and Ethers Test - 30

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Weekly Quiz Competition

Question 1
1 / -0

The IUPAC name of the following compound is:

A
3-cyclohexylpentan-3-ol

B
3-cyclohexyl,3-hydroxypentane

C
3-hydroxypentyl cyclohexane

D
none of the above

Solution

The IUPAC name of the given compound is 3-Cyclohexylpentan-3-ol.
The parent compound contains 5 C atoms and is named pentane.
A hydroxyl group is present at third C atom.
Hence, the last alphabet e of pentane is replaced with the suffix -3-ol.
A cyclohexyl ring is present as substituent at third carbon atom.
Question 2
1 / -0

The IUPAC name of the following compound is:

A
1-Phenylpropan-2-ol

B
3-Phenylpropan-2-ol

C
2-Hydroxypropylbenzene

D
None of these

Solution

The IUPAC name of the given compound is 1-Phenylpropan-2-ol.

The parent hydrocarbon contains 3 C atoms and is named as propane.

A hydroxyl group ($$-OH$$) is present at second C atom.

Hence, the last alphabet e of propane is replaced with the suffix -2-ol.

A phenyl group is present as a substituent at first carbon atom.
Question 3
1 / -0

$$CH_3-\underset{CH_3}{\underset{|}{C}H}-\underset{OH}{\underset{|}{C}H}-\underset{CH_3}{\underset{|}{\overset{CH_3\!\!\!\!\!}{\overset{|}{C}}}-}CH_3$$

The IUPAC name of the above given compound is:

A
2,2,4-Trimethylpentan-3-ol

B
2,4,4-trimethylpentan-3-ol

C
2-methyl-1-(2-methylpronyl)-propanol

D
none of the above

Solution

$$\overset{5}CH_3-\underset{CH_3}{\underset{|}{C}\overset{4}H}-\underset{OH}{\underset{|}{\overset{3}C}H}-\underset{CH_3}{\underset{|}{\overset{CH_3\!\!\!\!\!}{\overset{2|}{C}}}-}\overset{1}CH_3$$

The compound has 2 methyl groups at carbon number 2 and one methyl group at carbon number 4.

Functional group $$-OH$$ (ol) is attached at carbon number 3

So its name is 2, 2, 4-Trimethylpentan-3-ol.

Option A is correct.
Question 4
1 / -0

Which of the following reactions is possible?

A
$$\displaystyle Me_{3}C-ONa+Me_{3}C-Br\rightarrow Me_{3}C-O-CMe_{3}$$

B
$$\displaystyle Me_{2}CH-ONa+Me_{2}+Me_{2}CHMe_{2}CHBr\rightarrow Me_{2}CH-O-CHMe_{2}$$

C
$$\displaystyle PhONa+PhBr\rightarrow PhOPh$$

D
$$\displaystyle PhONa+CH_{3}Br\rightarrow PhOCH_{3}$$

Solution

Six types of ethers cannot be prepared by Williamson's synthesis.
A. Not feasible, $$\displaystyle RX=3^{\circ}, RONa=3^{\circ}$$
B. Not feasible, $$\displaystyle RX=2^{\circ}, RONa=2^{\circ}$$
C. Not feasible, ArX,
D. Feasible, $$\displaystyle RX=1^{\circ}, ArONa$$
Question 5
1 / -0

$$CH_3 - \underset{OH}{\underset{|}{\overset{CH_3}{\overset{|}{C}}}} - CH_2 - CH_3$$
The correct IUPAC name of the above compound is:

A
tert- amyl alcohol

B
2-methylbutan-2-ol

C
2-methylpentan-2-ol

D
1,1 dimethyl propan-1-ol

Solution

The IUPAC name of the given compound is 2-Methylbutan-2-ol.
The parent hydrocarbon contains 4 carbon atoms and is named butane.
A methyl substituent is present at second C atom.
A hydroxyl group is present at second C atom.
Hence, the last alphabet e of butane is replaced with the suffix -2-ol.
Question 6
1 / -0

IUPAC name of the given compound is:

A
5-ethylheptane-2.4-diol

B
3-ethylheptane-4,6-diol

C
4-ethyl-1-methylhexane-1,3-diol

D
none of these

Solution

The compound have ethyl group at carbon no $$5$$, two hydroxyl groups at carbon no $$2$$ and $$4$$. So its name is $$5-$$ethylheptane$$-2.4-$$diol.
Question 7
1 / -0

Which of the following is wood alcohol?

A
$$\displaystyle CH_{3}OH$$

B
$$\displaystyle C_{2}H_{5}OH$$

C
1-Butanol

D
2-Methyl -1-propanol

Solution

Methanol, also known as methyl alcohol, wood alcohol, wood naphtha, methyl hydrate, or wood spirits, is a chemical with the formula CH₃OH.

Methanol acquired the name wood alcohol because it was once produced chiefly by the destructive distillation of wood

Hence, the correct option is $$\text{A}$$
Question 8
1 / -0

Which of the following reactions is possible?

A
$$CH_3CH_2ONa + PhBr \rightarrow CH_3CH_2O - Ph$$

B
$$(CH_3)_3 C - ONa + CH_3CH_2Br \rightarrow (CH_3)_3 C - O - CH_2 - CH_3$$

C
$$CH_3CH = CH - ONa + CH_3CH = CH - Br \rightarrow CH_3CH = CH - O - CH = CH - CH_3$$

D
$$(CH_3)_3C - C - nCH_2 - ONa + (CH_3)_3 C - CH_2Br \rightarrow (CH_3)_3 C - CH_2 - O - CH_2 - C (CH_3)_3$$

Solution

a. Not feasible, RX= Neopentyl, RONa= Neopentyl
b. Not feasible, RX=Vinyl halide, RONa=Vinyl
c.Feasible $$\displaystyle RX=1^{\circ},RONa=3^{\circ}$$
d.Not feasible, Arx, RONa $$\displaystyle RX=1^{\circ},$$
Question 9
1 / -0

$$CH_3-\underset{OH}{\underset{|}{C}H}-\underset{OH}{\underset{|}{C}H}-CH_3$$

IUPAC name of the given compound is :

A
Butane-2,3-diol

B
1-Methyl-propane-1,2-diol

C
Both (A) and (B)

D
None of these

Solution

Two functional group $$OH (ol)$$ is attached at carbon no $$2$$ & $$ 3$$ so its name is butane$$-2,3-$$diol.
Question 10
1 / -0

Which of the following is produced during the following reaction?
$$\displaystyle CO\left ( g \right )+H_{2}\left ( g \right )\xrightarrow[ZnO,Cr_{2}O_{3}]{575 K}$$

A
Ethanol

B
Ethanal

C
Methanol

D
Methanal

Solution

Methanol is produced during the following reaction
$$\displaystyle CO\left ( g \right )+H_{2}\left ( g \right )\xrightarrow[ZnO,Cr_{2}O_{3}]{575 K} CH_3OH$$.

A mixture of CO and hydrogen (1:2 molar ratio) is called synthetic gas.

It is heated to a temperature of 573 K in presence of $$ZnO/ Cr_2O_3$$ catalyst to form methanol.

It is industrial method of preparation of methanol.

Option C is correct.

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Alcohols Phenols and Ethers Test - 30

Result

Alcohols Phenols and Ethers Test - 30

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Question 1

3-cyclohexylpentan-3-ol

3-cyclohexyl,3-hydroxypentane

3-hydroxypentyl cyclohexane

none of the above

Solution

Question 2

1-Phenylpropan-2-ol

3-Phenylpropan-2-ol

2-Hydroxypropylbenzene

None of these

Solution

Question 3

2,2,4-Trimethylpentan-3-ol

2,4,4-trimethylpentan-3-ol

2-methyl-1-(2-methylpronyl)-propanol

none of the above

Solution

Question 4

$$\displaystyle Me_{3}C-ONa+Me_{3}C-Br\rightarrow Me_{3}C-O-CMe_{3}$$

$$\displaystyle Me_{2}CH-ONa+Me_{2}+Me_{2}CHMe_{2}CHBr\rightarrow Me_{2}CH-O-CHMe_{2}$$

$$\displaystyle PhONa+PhBr\rightarrow PhOPh$$

$$\displaystyle PhONa+CH_{3}Br\rightarrow PhOCH_{3}$$

Solution

Question 5

tert- amyl alcohol

2-methylbutan-2-ol

2-methylpentan-2-ol

1,1 dimethyl propan-1-ol

Solution

Question 6

5-ethylheptane-2.4-diol

3-ethylheptane-4,6-diol

4-ethyl-1-methylhexane-1,3-diol

none of these

Solution

Question 7

$$\displaystyle CH_{3}OH$$

$$\displaystyle C_{2}H_{5}OH$$

1-Butanol

2-Methyl -1-propanol

Solution

Question 8

$$CH_3CH_2ONa + PhBr \rightarrow CH_3CH_2O - Ph$$

$$(CH_3)_3 C - ONa + CH_3CH_2Br \rightarrow (CH_3)_3 C - O - CH_2 - CH_3$$

$$CH_3CH = CH - ONa + CH_3CH = CH - Br \rightarrow CH_3CH = CH - O - CH = CH - CH_3$$

$$(CH_3)_3C - C - nCH_2 - ONa + (CH_3)_3 C - CH_2Br \rightarrow (CH_3)_3 C - CH_2 - O - CH_2 - C (CH_3)_3$$

Solution

Question 9

Butane-2,3-diol

1-Methyl-propane-1,2-diol

Both (A) and (B)

None of these

Solution

Question 10

Ethanol

Ethanal

Methanol

Methanal

Solution

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