Alcohols Phenols and Ethers Test

Result

Alcohols Phenols and Ethers Test - 81

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Weekly Quiz Competition

Question 1
1 / -0

$$IUPAC$$ name of the given compound is

A
$$1-$$chloro $$-4-$$methyl$$-2-$$hexanol

B
$$1-$$chloro $$-4-$$ethyl$$-2-$$pentanol

C
$$1-$$chloro $$-4-$$methyl$$-2-$$hexanol

D
$$1-$$chloro $$-2-$$hydroxy$$-4-$$methyl hexanol

Solution
Question 2
1 / -0

$$IUPAC$$ name of the compound
$${C}H_2 = {C}H-{C}H_2-{C}H_2OH$$ is

A
$$1-$$buten$$-4-$$ol

B
$$3-buten-1-ol$$

C
$$4-$$hydroxy-$$1-$$butene

D
$$1-$$butene$$-4-ol$$
Question 3
1 / -0

The name of $$\begin{matrix} { H }_{ 3 }C-CH-CH-{ CH }_{ 3 } \\ |\qquad | \\ { CH }_{ 3 }\qquad OH \end{matrix}$$

The $$IUPAC$$ nomenclature is:

A
Butanol

B
$$2-$$methyl butanol-3

C
$$3-$$methyl butan 2-ol

D
Pentanol

Solution
Question 4
1 / -0

The reaction, water gas $$ (CO+H_2)+H_2 $$ 673K,300 atmosphere in presence of the catalyst $$ Cr_2O_3 /ZnO $$ is used for the manufacture of

A
HCHO

B
HCOOH

C
$$ CH_3OH $$

D
$$ CH_3COOH $$

Solution

$$ \underbrace { CO+H_2 }_{ Water \ gas } +H_2 \xrightarrow [ 672 K, 200atm]{Cr_2O_2/ZnO} CH_3OH $$

Option C
Question 5
1 / -0

Commercially methanol is prepared by

A
Reduction of CO in presence of $$ ZnO.Cr_2O_3 $$

B
Methane reacts with water vapours at 900 $$^oC$$ in presence of Ni catalyst

C
Reduction of HCHO by $$ LiAlH_4 $$

D
Reduction of HCHO by aqueous NaOH

Solution

$$ CO+H_{ 2 }\xrightarrow [ 573K,200atm ]{ CuO-ZnO-Cr_{ 2 }O_{ 3 } } \begin{matrix} CH_ 3OH \\ Methanol \end{matrix} $$

Methanol is prepared commercially by the reduction of Carbon monoxide in presence of $$ZnO-Cr_{ 2 }O_{ 3 }$$

Option A is correct.
Question 6
1 / -0

The $$IUPAC$$ name of the compound $$\begin{matrix} { CH }_{ 3 }-C={ CH }_{ 2 }{ CH }_{ 2 }OH \\ | \\ { CH }_{ 3 } \end{matrix}$$ is

A
$$2-$$methyl$$-2-$$butenol

B
$$2-$$methyl$$-3-$$butenol

C
$$3-$$methyl$$-2-$$butenol

D
$$2-$$methyl byt-$$-2-$$enol

Solution
Question 7
1 / -0

Propene, $$ CH_3-CH=CH_2 $$ can be converted to l-propanol by oxidation. Which set of regents among the following is ideal to effect the conversion

A
Alkaline $$ KMnO_4 $$

B
$$ B_2H_6 $$ and alkaline $$ H_2O_2 $$

C
$$O_3 $$ /Zn dust

D
$$ OsO_4/CH_4,CL_2 $$

Solution

Hydroboration oxidation (Industrial preparation of alcohol)
$$ 3CH_3CH=CH_2 + \frac {1}{2}B_2H_6 \xrightarrow [ether]{Dry}(CH_3CH_2CH_3)_3 B (CH_3CH_2CH_3)_3B \xrightarrow []{H_2O_2} 3CH_3CH_2CH_2-OH $$
Question 8
1 / -0

Which of the following statements is correct regarding case of dehydration in alcohols?

A
Primary > Secondary

B
Secondary > Tertiary

C
Tertiary > Primary

D
None of these

Solution

Dehydration of alcohol forms carbocation as intermediate. More stable is the carbocation, ease of reaction is more.
The order of stability of carbocation is:
$$tertiary>secondary>primary$$

So, the dehydration of tertiary alcohol is faster than the dehydration of the secondary alcohol and the dehydration of the secondary alcohol is faster than the dehydration of primary alcohol.

Hence, the option $$C$$ is correct.
Question 9
1 / -0

In which case methyl-t-butyl ether is formed

A
$$ (C_2H_5)_3CONa+CH_3Cl $$

B
$$ (CH_3)_3CONa+CH_3Cl $$

C
$$ (CH_3)_3CONa+C_2H_5Cl$$

D
$$ (CH_3)_3CONa+CH_3Cl$$

Solution

$$(CH_3)_3CONa+CH_3Cl$$ are required to form Methyl-t-butyl ether.

Option B is correct.
Question 10
1 / -0

The compound which gives the most stable carbonium on dehydrogenation

A
$$CH_3-\underset{CH_3}{\underset{|}{CH}}-CH_2OH$$

B
$$CH_3-\overset{CH_3}{\overset{|}{\underset{CH_3}{\underset{|}{C}}}}-OH$$

C
$$CH_3-CH_2-CH_2-CH_2OH$$

D
$$CH_3-\underset{CH_3}{\underset{|}{CH}}-CH_2-CH_3$$

Solution

Tert-butanol loses an $$−OH$$ group to give most stable carbonium ion. The positive charge on carbon atom is stabilized by $$+I$$ inductive effect of 3 methyl groups.