Isomerism

Q. Which amongst the following is a positional isomer of ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{CH}={\mathrm{CH}}_3$

1. ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_3$
2. ${\mathrm{CH}}_3-\mathrm{CH}={\mathrm{CH}}_3$
3. ${\mathrm{CH}}_3-\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_3$
4. ${\mathrm{CH}}_3-C\equiv C-{\mathrm{CH}}_3$

Q. Draw the structure of isomers of:
(a) butane (b) pentane.
Write the IUPAC and common names of these isomers.
[2 MARKS]

Q.

The isomer of diethyl ether is

1. $(C{H}_3{)}_{3}C-OH$

2. $(C{H}_3{)}_{2}CHOH$

3. $C_3{H}_{2}OH$

4. $(C_2{H}_5{)}_{2}CHOH$

Q.

Butanone and butanol are isomers.

1. True

2. False

Q. (a)

Draw the structures for the following compound: ​
(i) Ethanoic acid

(b)
(ii) Bromopentane

(c)
(iii) Butanone

(d)
(iv) Hexanal

(e)
Are structural isomers possible for bromopentane?

Q. Which of the following are structural isomers?

1. 2-methylpropane, propane
2. Methane, 2-methylpropane
3. Butane, 2-methylpropane
4. n-propane, n-butane

Q.

In which among the following compounds , hydrogen shows a negative valency?

1. H₂SO₄

2. HCl

3. NaHCO₃

4. NaH

Q. Which of the following are correct structural isomers of butane?
(i)

(ii)

(iii)

(iv)

(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (ii)
(d) (iii) and (iv)

Q. chemical formula of sodium nitrate

Q. Which of the following are correct structural isomers of butane?
(i)

(ii)

(iii)

(iv)

(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (ii)
(d) (iii) and (iv)

Q. Question 5
Which of the following are correct structural isomers of butane?
(i)

(ii)

(iii)

(iv)

(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (ii)
(d) (iii) and (iv)

Q.

Which of the following is true in case of structural isomerism?

1. Same molecular formula

2. Same molecular weight

3. Same properties

4. Different structural formula

Q. What is the formula of sodium nitrate?

Q.

The number of structural isomers of $C_6{H}_{14}$ is

1. 3

2. 4

3. 5

4. 2

Q.

Which of the following is not correct for isomers?

1. Same molecular formula

2. Different molecular weight

3. Different Properties

4. None of these.

Q.

Why are the properties of isomers different?

Q. $Xe{F}_2$ molecule has a ___ structure .

Q. Degree of unsaturation in the given compound is:

1. 6
2. 8
3. 10
4. 7

Q.

What are the chemical formulas of red phosphorus, white phosphorus, ammonium trisulphide and potassium chlorate?

Q. The maximum number of isomers possible for n-pentane is.

1. two
2. three
3. four

Q. Which of the following are correct structural isomers of butane?
(i)

(ii)

(iii)

(iv)

(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (ii)
(d) (iii) and (iv)

Q. Which of the following are structural isomers?

1. 2-methylpropane, propane
2. Methane, 2-methylpropane
3. Butane, 2-methylpropane
4. n-propane, n-butane

Q.

The structure given below shows the isomeric form of

1. Hexane

2. Butane

3. Pentane

4. Pentene

Q. Question 4 (b)
Draw the structure of the compound Bromopentane. Are structural isomers possible for Bromopentane?

Q. Write down the structure of $C_4{H}_{10}$ then write possible isomeric forms of the same.

Q. How many structural and geometrical isomers are possible for a cyclohexane derivative having the molecular formula, $C_8{H}_{16}$?

Q.

1. Isomers have same ________________formula but different _____________formula.

Q.

Which of the following is not correct for isomers?

1. Same molecular formula

2. Different molecular weight

3. Different Properties

4. None of these.