Physical Properties of Alcohols and Phenols

Q. The relative rate of acid catalyzed dehydration of following alcohols would be:

1. I > III > IV > II
2. III > I > IV > II
3. III > IV > II > I
4. III > IV > I > II

Q.

The most suitable method of the separation of a 1 : 1 mixture of ortho and para nitrophenols is [CBSE PMT 1994, 99; CPMT 1997]

1. Sublimation

2. Chromatography

3. Crystallization

4. Distillation

Q.

Ortho-nitrophenol is steam volatile whereas para-nitrophenol is not. This is due to [CBSE PMT 1989]

1. None of these

2. Intermolecular hydrogen bonding

3. Intramolecular hydrogen bonding present in para-nitrophenol

4. Intramolecular hydrogen bonding present in ortho-nitrophenol

Q. Which of the following gem diols is stable:

$\left(a\right)H_{3}C-\stackrel{OH}{\stackrel{|}{\underset{O{H}_3}{\underset{|}{C}}}}-H\left(b\right)B{r}_{3}C-\stackrel{OH}{\stackrel{|}{\underset{OH}{\underset{|}{C}}}}-H$
$\left(c\right)F_{3}C-\stackrel{OH}{\stackrel{|}{\underset{OH}{\underset{|}{C}}}}-H\left(d\right)H_5{C}_6-\stackrel{OH}{\stackrel{|}{\underset{OH}{\underset{|}{C}}}}-C_6{H}_5$

1. a
2. c
3. d
4. b

Q. Choose correct option:-

1. Ethers are acidic in nature
2. Bond angle in methyl alcohol is greater than 109⁰ 28'
3. Hydroboration-Oxidation of alkenes is in accordance with Markownikoff’s rule
4. Carbon-Oxygen linkage bond length is shorter in phenol than in methanol

Q.

Ether is more volatile than alcohol having same molecular formula. This is due to:

1. Inter-molecular hydrogen bonding in alcohol

2. Dipolar character of ether

3. Alcohols having resonance structure

4. Inter-molecular hydrogen bonding in ether

Q.

Which of the following statements is correct regarding case of dehydration in alcohols [CPMT 1980, 85; MP PMT 2001; BHU 2002]

1. Primary > Secondary

2. Secondary > Tertiary

3. Tertiary > Primary

4. None of these

Q.

Glycerol boils at 290^oC with slight decomposition. Impure glycerine can be purified by[CPMT 1983, 94]

1. Steam distillation

2. Vacuum distillation

3. Simple distillation

4. Extraction with a solvent

Q. Ortho-nitrophenol is steam volatile whereas para-nitrophenol is not. This is due to
$1.$Intramolecular hydrogen bonding present in ortho-nitrophenol
$2.$Intermolecular hydrogen bonding present in para-nitrophenol
$3.$Intramolecular hydrogen bonding present in para-nitrophenol
$4.$Inter-molecular hydrogen bonding present in ortho-nitrophenol.

1. 1&3
2. 1&2
3. 2 only
4. 1, 3 &4

Q.

The boiling point of alcohol are .... than corresponding thiols [Pb. PMT 2000]

1. Either of these

2. Same

3. More

4. Less