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Solutions for Hydrocarbons Important Questions

Q: Consider the nitration of benzene using mixed conc. H2SO4 and HNO3 . If a large amount of KHSO4 is added to the mixture, the rate of nitration will be:

If we add KHSO4−, conc. HSO4− increases, equilibrium shifts backward.

Q: The radical, is aromatic because it has:

Only benzene is considered in aromatic which has 6p -orbitals (π− electrons) and 6 unpaired electrons are present.

Q: Which of the following compounds will not undergo Friedal - Craft's reaction easily:

−NO2 group is strong deactivating.∴ It inhibits F.C.R.

Q: With respect to the conformers of ethane, which of the following statements is true?

There is no change in bond angles and bond lengths in the conformations of ethane. There is only change in dihedral angle.

Q: The heat of combustion of carbon to CO2 is –393.5 kJ/mol. The heat released upon formation of 35.2 g of CO2 from carbon and oxygen gas is:

Formation of CO2 from carbon and dioxygen gas can be represented asC(s)+O2(g)→CO2(g);△fH=−393.5kJmol−1 (1 mole = 44 g)Heat released on formation of 44 g CO2 = −393.5 kJ mol−1 =44g−393.5kJmol−1×35.2g =−315kJ

Q: How do you account for the formation of ethane during chlorination of methane?

During chlorination of methane, ethane is formed due to side reaction in termination step by the combination of two methyl free radicals.

Q: For the following compounds, write structural formulas and IUPAC names for all possible isomers having the number of double or triple bond as indicated : (a)C4H8 (one double bond) (b)C5H8 (one triple bond)

(a) Isomers of C4H8 having one double bond are:

Question 1

Medium

An alkene on ozonolysis gives methanal as one of the product. Its structure is:

Topic:

Hydrocarbons

Book:

Fundamentals of Physics, Extended

Exam:

NEET 2020

View 3 solutions

Question 2

Easy

The most suitable reagent for the following conversion, is :

Na/liquid $N H_{3}$
$H_{2}, P d / C,$ quinoline
Zn/HCl
$H g^{2 +} / H^{+}, H_{2} O$

Topic:

Hydrocarbons

Book:

Fundamentals of Physics, Extended

Exam:

NEET 2019

View 5 solutions

Question 3

Easy

The compound undergoes the following

C_{7} H_{8}

reactions :

The product 'C' is :

3-bromo-2,4,6-trichlorotoluene
o-bromotoluene
m-bromotoluene
p-bromotoluene

Topic:

Hydrocarbons

Book:

Fundamentals of Physics, Extended

Exam:

NEET 2018

View 5 solutions

Question 4

Easy

Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is :

$CH_{3} - CH_{3}$
$CH_{2} = CH_{2}$
$CH \equiv CH$
$CH_{4}$

Topic:

Hydrocarbons

Book:

Fundamentals of Physics, Extended

Exam:

NEET 2018

View 14 solutions

Question 5

Medium

In the reaction

X and Y are:

X = 1 – Butyne ; Y = 3 – Hexyne
X = 2 – Butyne ; Y = 3 – Hexyn
X = 2 – Butyne ; Y = 2 – Hexyne
X = 1 – Butyne ; Y = 2 – Hexyne

Topic:

Hydrocarbons

Book:

Chemistry

Exam:

NEET 2016

View 17 solutions

Question 6

Medium

Consider the nitration of benzene using mixed conc.

H_{2} S O_{4}

and

H N O_{3}

. If a large amount of KHSO

_{4}

is added to the mixture, the rate of nitration will be:

Faster
Slower
Unchanged
Doubled

Topic:

Hydrocarbons

Book:

Chemistry

Exam:

NEET 2016

View 13 solutions

Question 7

Medium

What products are formed when the following compounds is treated with

Br_{2}

in the presence of

FeBr_{3}

Topic:

Hydrocarbons

Book:

Chemistry

Exam:

NEET 2014

View 20 solutions

Question 8

Easy

The structure of isobutyl group in an organic compound is:

$(C H_{3})_{3} C -$
$(C H_{3})_{2} CH - C H_{2} -$
$C H_{3} - C ∣ H - C H_{2} - C H_{3}$
$C H_{3} - C H_{2} - C H_{2} - C H_{2} -$

Topic:

Hydrocarbons

Book:

Chemistry

Exam:

NEET 2013

View 13 solutions

Question 9

Easy

Nitrobenzene on reaction with conc.

HNO_{3} / H_{2} SO_{4}

80 - 10 0^{\circ} C

forms which one of the following products?

1,2 - Dinitrobenzene
1,3 - Dinitrobenzene
1,4 - Dinitrobenzene
1,2,4-Trinitrobenzene

Topic:

Hydrocarbons

Book:

Chemistry

Exam:

NEET 2013

View 5 solutions

Question 10

Easy

The radical, is aromatic because it has:

6 p-orbitals and 6 unpaired electrons
7 p-orbitals and 6 unpaired electrons
7 p-orbitals and 7 unpaired electrons
6 p-orbitals and 7 unpaired electrons

Topic:

Hydrocarbons

Book:

Chemistry

Exam:

NEET 2013

View 18 solutions

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Question 11

Medium

Which of the following compounds will not undergo Friedal - Craft's reaction easily:

Cumene
Xylene
Nitrobenzene
Toluene

Topic:

Hydrocarbons

Book:

Chemistry

Exam:

NEET 2013

View 7 solutions

Question 12

Easy

With respect to the conformers of ethane, which of the following statements is true?

Bond angle remains same but bond length changes
Bond angle changes but bond length remains same
Both bond angle and bond length change.
Both bond angles and bond length remains same,

Topic:

Hydrocarbons

Book:

Linear Algebra: A Modern Introduction

Exam:

NEET 2017

View 7 solutions

Question 13

Easy

2,3-Dimethyl-2-butene can be prepared by heating which of the following compounds with a strong acid?

$(C H_{3})_{2} C = C H - C H_{2} - C H_{3}$
$(C H_{3})_{2} C H - C H_{2} - C H = C H_{2}$
$(C H_{3})_{3} C - C H = C H_{2}$

Topic:

Hydrocarbons

Book:

Linear Algebra: A Modern Introduction

Exam:

NEET 2015

View 16 solutions

Question 14

Medium

In the reaction with HCl, an alkene reacts in accordance with the Markovnikov’s rule, to give a product 1-chloro-1- methylcyclohexane. The possible reaction alkene is:

Topic:

Hydrocarbons

Book:

Linear Algebra: A Modern Introduction

Exam:

NEET 2015

View 8 solutions

Question 15

Medium

The heat of combustion of carbon to

C O_{2}

is –393.5 kJ/mol. The heat released upon formation of 35.2 g of

C O_{2}

from carbon and oxygen gas is:

−630 kJ
−3.15 kJ
−315 kJ
+315 kJ

Topic:

Hydrocarbons

Book:

Linear Algebra: A Modern Introduction

Exam:

NEET 2015

View 12 solutions

Question 16

Medium

The oxidation of benzene by

V_{2} O_{5}

in the presence of air produces:

Benzoic acid
Benzaldehyde
Benzoic anhydride
Maleic anhydride

Topic:

Hydrocarbons

Book:

Linear Algebra: A Modern Introduction

Exam:

NEET 2015

View 16 solutions

Question 17

Medium

How do you account for the formation of ethane during chlorination of methane?

Topic:

Hydrocarbons

Book:

Chemistry Part-II (NCERT)

View 13 solutions

Question 18

Medium

Write IUPAC names of the following compounds:

Topic:

Hydrocarbons

Book:

Chemistry Part-II (NCERT)

View 33 solutions

Question 19

Medium

For the following compounds, write structural formulas and IUPAC names for all possible isomers having the number of double or triple bond as indicated :
(a)

C_{4} H_{8}

(one double bond) (b)

C_{5} H_{8}

(one triple bond)

Topic:

Hydrocarbons

Book:

Chemistry Part-II (NCERT)

View 3 solutions

Question 20

Medium

Write IUPAC names of the products obtained by the ozonolysis of the following compounds : (i) Pent-2-ene (ii) 3,4-Dimethylhept-3-ene (iii) 2-Ethylbut-1-ene (iv) 1-Phenylbut-1-ene

Topic:

Hydrocarbons

Book:

Chemistry Part-II (NCERT)

View 5 solutions

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Solutions for Hydrocarbons Important Questions

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