Hydrocarbons Test

Result

Hydrocarbons Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following compound is not suitable to obtain from wurtz reaction?

A
Ethane

B
Butane

C
Isobutane

D
Hexane

Solution

Through Wurtz reaction formation of isobutane is possible but lot of side products will also form. So it is not suitable for isobutane.
Wurtz reaction is possible for formation of alkanes having even no. of carbon atoms.
Question 2
1 / -0

Using anhydrous $$AlCl_3$$ as catalyst, which one of the following reaction produces ethylbenzene $$(PhEt)$$?

A
$$H_2C=CH_2+C_6H_6$$

B
$$H_3C-CH_3+C_6H_6$$

C
$$H_3C-CH_2OH+C_6H_6$$

D
$$CH_3-CH=CH_2+C_6H_6$$

Solution

R.E.F image
$$ CH_{2} = CH_{2} \overset{AlCl_{3}/HCl}{\rightarrow} CH_{3}-C^{\oplus}H_{2}+AlCl_{4}^{\circleddash } $$
Question 3
1 / -0

In the following sequence of reactions:
Toluene $$\overset{KMnO_4}{\rightarrow} A\overset{SOCl_2}{\rightarrow} B\overset{H_2/Pd}{\underset{BaSO_4}{\rightarrow}}C$$.
What is C?

A
Benzaldehyde

B
Benzoic acid

C
Benzoyl chloride

D
Acetophenone

Solution
Question 4
1 / -0

How will you prepare ethane from methyl chloride?

A
Williamson's synthesis

B
Wurtz synthesis

C
Hydrogenation of methyl chloride

D
Dehydrohalogenation of methyl chloride

Solution

$$ C_{2}H_{6} $$ will be lest peppered by ethane synthesis from $$ CH_{3}Cl $$
$$ CH_{3}Cl +2Na\rightarrow CH_{3}^{-}Na^{+}+NaCl $$
$$ CH_{3}^{-}Na^{+}+CH_{3}-Cl\rightarrow C_{2}H_{6}+NaCl $$
Question 5
1 / -0

Which of the following compound, on reaction with excess of RMgX, gives 3 moles of alkane (R-H)?

A
$$HC \equiv C -{\underset{OH}{\underset{|}{C}}H} - COOH$$

B
$$CH_3 - C \equiv C -{\underset{OH}{\underset{|}{C}}H} - COOH$$

C
$$HC \equiv C -{\underset{OCH_3}{\underset{|}{C}}H} - COOH$$

D
$$CH_2 = CH -{\underset{OH}{\underset{|}{C}}H} - COOH$$

Solution

$$HC \equiv C - \underset{OH}{\underset{|}{C}H} - COOH \xrightarrow{3 R-MgX} \,^{\circleddash}C \equiv C - \underset{\,\,O^{\circleddash}}{\underset{|}{C}}\!\!H - COO^{\circleddash} + 3R-H$$
Question 6
1 / -0

Which of the following reactions would give isopropyl benzene as the major product?

A
a, d

B
b, c

C
b, c, d

D
All of these

Solution

All of these :
(Intermediate is $$> \oplus $$ in all )
Question 7
1 / -0

The reaction,

$${ CH }_{ 2 }=CH-{ CH }_{ 3 }+HBr\rightarrow { CH }_{ 3 }CH(Br)-{ CH }_{ 3 }$$ is :

A
nucleophilic addition

B
electrophilic substitution

C
electrophilic addition

D
free radical addition

Solution

Addition of $$H-x(x \rightarrow$$ Halogens $$)$$ on alkenes follows electrophilic addition mechanism.
so, option (C) is correct
Question 8
1 / -0

Which one of the following is expected to have minimum boiling point?

A
n-Butane

B
n-Pentane

C
$$2$$-Methylbutane

D
$$2,2$$ - Dimethylpropane

Solution

The boiling point is directly proportional to molecular mass. So n-butane among given will have a minimum boiling point.
Question 9
1 / -0

Product of the reaction is:

A

B

C

D

Solution
Question 10
1 / -0

Which of the following will allow free rotation about double bond?
[arrows indicate the bond to be considered]

A

B

C

D