Structure and Physical Properties of Ethers

Q.

Explain why alcohols and ethers of comparable molecular mass have different boiling points?

Q.

The thiol group is present in:

1. cystine

2. cysteine

3. methionine

4. cytosine

Q. Write the structure of n-methylethanamine.

Q.

The compound with highest boiling point is:

1. CH₃Cl

2. CH₃OCH₃

3. CH₄

4. CH₃OH

Q.

According to Lewis concept of acids and bases, ethers are

1. Amphoteric

2. Neutral

3. Basic

4. Acidic

Q.

According to Lewis concept of acids and bases ethers are:

1. Neutral

2. Basic

3. Amphoteric

4. Acidic

Q.

Assertion (A) Bond angle in ethers is slightly less than the tetrahedral angle.
Reason (R) There is a repulsion between the two bulky (- R) groups.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Q.

Assertion: Bond angle in ethers is slightly less than the tetrahedral angle.

Reason: There is a repulsion between the two bulky $(-R)$ groups.

1. Assertion and reason both are wrong statements.

2. Assertion and reason both are correct, and reason is correct explanation of assertion.

3. Assertion is correct statement, but reason is wrong statement.

4. Both assertion and reason are correct statements, but reason is not correct explanation of assertion.

5. Assertion is wrong statement, but reason is correct statement.

Q. Arrange the following molecules in the decreasing order of bond angle.
$\left(i\right)N{H}_3\left(ii\right)C{H}_4\left(iii\right)B{F}_3\left(iv\right)BeC{l}_2$

1. $i>ii>iii>iv$
2. $iv>iii>ii>i$
3. $iv>iii>i>ii$
4. $ii>i>iii>iv$

Q.

Oxygen atom in ether is

1. Replaceable

2. Active

3. Very active

4. Comparatively inert

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c) If assertion is true but reason is false.
(d) If assertion and reason both are false.

Assertion : HOF bond angle is greater than HOCl bond angle.
Reason : Oxygen is more electronegative than halogens

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

Q. A: Victor-Meyer's test is used to distinguish between $1^{\circ },2^{\circ },3^{\circ }$ alchohols as well as nitro compounds.
R: Victor-Meyer's method is used to determine molecular weight of volatile organic compounds.

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true

Q. How many isomers of c5H11 oH will be primary alcohol

Q. 21. Find correct statements regarding following molecules. a) I, II & III are meso b) II & III are enantiomers c) I & IV are diastereomers d) III & IV are diastereomers

Q. The members of group 14 form tetrahalides of the type MX4. Which of the following halides cannot be readily hydrolysed by water 1. CH4 2. SiX4 3. GeX4 4.SnX4

Q. Given below are two statements labelled as Assertion (A) and Reason (R).
Assertion (A): The bond angle in alcohol is slightly more than the tetrahedral angle.

Reason (R): Variation in bond angle of alcohol is due to the repulsion between the unshared electron pair of oxygen.

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true

Q. Among ethanol, dimethyl ether, methanol and propanal, the isomers are

1. ethanol, dimethyl ether, methanol and propanal
2. ethanol and dimethyl ether
3. ethanol, dimethyl ether, and methanol
4. ethanol and methanol

Q. 15. Why does molarity becomes equal to molality on infinite dilution?

Q. The states of hybridisation of boron and oxygen in $H_{3}B{O}_3$ are respectively

1. 
2. 
3. 
4. 

Q.

Are the statements true or false -

Statement-1: The dihedral angle of H₂O₂ in gas is 90°.

Statement-2: Dihedral angle of H₂O₂ in solid is 111°.

1. True, True

2. True, False

3. False, True

4. False, False

Q. Hydrogen bonding is absent in ether.

1. True
2. False

Q.

The empirical formula of a compound is ${\mathrm{CH}}_4\mathrm{N}$. The empirical formula mass of the compound is equal to its vapour density. Which among the following compounds possesses the same number of carbon atoms as present in the above compound?

1. ${\mathrm{Na}}_2{\mathrm{CO}}_3$

2. $\mathrm{Ca}{\left({\mathrm{HCO}}_3\right)}_2$

3. ${\mathrm{Al}}_2{\left({\mathrm{CO}}_3\right)}_3$

4. $\mathrm{Fe}{\left({\mathrm{HCO}}_3\right)}_3$

Q. Ether is less soluble in water than alcohol.

1. True
2. False

Q. Assertion :Ethers behave as bases in the presence of mineral acids. Reason: It is due to the presence of lone pair of electrons on the oxygen atom.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion.
3. Assertion is correct, but Reason is incorrect.
4. Assertion is incorrect, but Reason is correct.

Q. Ether is more volatile than alcohol having same molecular formula because of:

1. dipolar character of ether
2. alcohols having resonance structure
3. intermolecular hydrogen bonding in ethers
4. intermolecular hydrogen bonding in alcohols

Q. Which of the following statement regarding solubility of ethers in water is true?

1. Ethers are sparingly soluble in water due to the formation of hydrogen bond with water.
2. Ethers are highly soluble in water due to the formation of hydrogen bond with water.
3. Ethers are sparingly soluble in water as they cannot form hydrogen bond with water.
4. Ethers are highly soluble in water as they are polar in nature.

Q.

formula of ethanol

Q.

Oxygen atom in ether is

1. Very active

2. Replaceable

3. Active

4. Comparatively inert

Q. An oxygen-containing organic compound was found to contain 52% carbon and 13% of hydrogen. Its vapour density is 23. The compound reacts with sodium metal to liberate hydrogen. A functional isomer of this compound is :

1. ethanol
2. ethanal
3. methoxy methane
4. methoxy ethane

Q. The compound in which hydrogen bonding is not possible is:

1. $C{H}_{3}C{H}_{2}OH$
2. $C{H}_{3}OC{H}_3$
3. $H_{2}O$
4. $C{H}_{3}COOH$