Haloalkanes and Haloarenes Test

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Haloalkanes and Haloarenes Test - 38

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is not true for $$S_N1$$ reaction?

A
Favoured by polar solvents.

B
$$3^o -$$ alkyl halides generally react through $$S_N1$$ reaction.

C
The rate of the reaction does not depend upon the molar concentration of the nucleophile.

D
$$1^o -$$ alkyl halides generally react through $$S_N1$$ reaction.

Solution

Primary alkyl halides generally react through $$S_{N}{2}$$ reaction.

Tertiary alkyl halides generally react through $$SN_1$$ reaction.

As in $$S_{N}{1}$$ mechanism the carbocation forms and the stability order for carbocation is $$3^0 > 2^0 > 1^0$$

The option (D) is not true for $$S_N1$$ reaction.

Option D is correct.
Question 2
1 / -0

Which of the following carbon-halogen bond is extremely polar though nonionic among given alkyl halides?

A
$$C-F$$

B
$$C-Br$$

C
$$C-Cl$$

D
$$C-I$$

Solution

$$C - F$$ bond is extremely polar because Flourine is most Electronegative atom (E.N = 4.0) so the E.N difference is more for carbon and Flourine.
Polarity order : $$C - F > C - Br > C - Cl > C- I$$
Question 3
1 / -0

Which among the given haloalkanes develop colour when exposed to light?

A
$$R-Br$$ and $$R-Cl$$

B
$$R-I$$ and $$R-F$$

C
$$R-Cl$$ and $$R-Br$$

D
$$R-Br$$ and $$R-I$$

Solution

As we progress down the periodic table from fluorine to iodine, molecular size increases. As a result, we also see an increase in bond length. As the bond length increases, upon irradiation of light, after absorption the compound emit light in visible region. Hence, R-Br and R-I bond exhibit color when exposed to light.
Question 4
1 / -0

The IUPAC name for tertiary butyl iodide is:

A
4-iodobutane

B
2-iodobutane

C
1-iodo-3-methylpropane

D
2-iodo-2-methylpropane

Solution

Explanation:
There are certain steps that we follow during IUPAC nomenclature such as;
Step 1 :- Find and name the longest continuous carbon chain.
Step 2 :- Identify and name groups attached to this chain.
Step 3 :- Do the numbering
Step 4 :- Designate the location of each substituent group by an appropriate number and name.
Step 5 :- Assemble the name, listing groups in alphabetical order using the full name.

So, here in this case the longest continuous chain is of $$3 \ C$$ so the base name would be $$propane$$
There is a methyl group and Iodine group present at $$C - 2$$ position so the substituent naming would be according to alphabetical order as; $$ 2-Iodo-2-Methyl$$

Therefore, The IUPAC name of a compound is $$2-iodo-2-methylpropane$$.

Correct Option: $$D$$.
Question 5
1 / -0

Arrange the alkyl in decreasing order of their mass.

A
$$CH_3Cl > H_2O > CH_3Br$$

B
$$CH_3Cl>CH_3Br>H_2O$$

C
$$CH_3Br> CH_3Cl > H_2O $$

D
$$H_2O > CH_3Cl > CH_3Br$$

Solution

$$CH_{3}Br$$ Atomic mass  $$\Rightarrow$$ $$12+3+80=95$$
$$CH_{3}Cl$$ Atomic mass  $$\Rightarrow$$ $$12+3+35.5=50.5$$
$$H_{2}O$$ Atomic mass  $$\Rightarrow$$ $$16+2=18$$
According to given Atomic masses of compounds the decreasing order is $$CH_{3}Br>CH_{3}Cl>H_{2}O$$.
Question 6
1 / -0

Arrange in correct order of density:

A
$$CH_2Cl_2 < CHCl_3 < CCl_4$$

B
$$CH_2Cl_2 > CCl_4 > CHCl_3$$

C
$$CCl_4 < CH_2Cl_2 < CHCl_3$$

D
$$CH_2Cl_2 > CCl_4 < CHCl_3$$

Solution

Haloalkanes are generally more dense than the alkane from which they are derived. Density increases with the number of carbon and halogen atom. It also increases with the increase in mass of halogen atom. Atomic mass of halogens increases down the group.
Question 7
1 / -0

Which of the following pairs are correctly matched?
Reactants Products
I. $$RX + AgO{H} (aq)$$ $$RH$$
II. $$RX + AgC{N} (alco)$$ $$RCN$$
III. $$RX + KC{N} (alco)$$ $$RNC$$
IV. $$RX + {Na} (ether)$$ $$R-R$$

A
I alone

B
I and II

C
II and III

D
II and IV

Solution

$$RX+AgOH (aq)\rightarrow R-OH+ AgX$$

$$RX+AgCN (aq)\rightarrow AgX+RNC$$

$$RX+KCN (alcoholic) \rightarrow KX+RCN$$

$$RX+Na\xrightarrow{ether} R-R$$

II and IV are correct.
Question 8
1 / -0

Haloalkane in the presence of alcoholic $$KOH$$ undergoes:

A
elimination

B
polymerisation

C
dimerisation

D
substitution

Solution

Haloalkanes in the presence of alcoholic KOH undergoes elimination reaction or dehydrohalogenation reaction.
$$CH_3CH_2CH_2Br+alc. KOH\rightarrow CH_3CH=CH_2+KBr+H_2O$$
Question 9
1 / -0

Physical properties of any compound depend largely on:

A
its mass

B
the type of intermolecular and intramolecular forces of attraction

C
both mass and type of intermolecular and intramolecular forces of attraction

D
none of the above

Solution

Physical properties of any compound depend largely on both mass and type of intermolecular and intramolecular forces of attractions.
Question 10
1 / -0

The only methyl halide which is a liquid is at room temperature is :

A
iodomethane

B
bromomethane

C
chloromethane

D
fluoromethane

Solution

Methyl iodide, also called iodomethane, is the chemical compound with the formula CH₃I. It is a dense, colorless, volatile liquid.

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Reactants	Products
I. $$RX + AgO{H} (aq)$$	$$RH$$
II. $$RX + AgC{N} (alco)$$	$$RCN$$
III. $$RX + KC{N} (alco)$$	$$RNC$$
IV. $$RX + {Na} (ether)$$	$$R-R$$

Haloalkanes and Haloarenes Test - 38

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Haloalkanes and Haloarenes Test - 38

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Question 1

Favoured by polar solvents.

$$3^o -$$ alkyl halides generally react through $$S_N1$$ reaction.

The rate of the reaction does not depend upon the molar concentration of the nucleophile.

$$1^o -$$ alkyl halides generally react through $$S_N1$$ reaction.

Solution

Question 2

$$C-F$$

$$C-Br$$

$$C-Cl$$

$$C-I$$

Solution

Question 3

$$R-Br$$ and $$R-Cl$$

$$R-I$$ and $$R-F$$

$$R-Cl$$ and $$R-Br$$

$$R-Br$$ and $$R-I$$

Solution

Question 4

4-iodobutane

2-iodobutane

1-iodo-3-methylpropane

2-iodo-2-methylpropane

Solution

Question 5

$$CH_3Cl > H_2O > CH_3Br$$

$$CH_3Cl>CH_3Br>H_2O$$

$$CH_3Br> CH_3Cl > H_2O $$

$$H_2O > CH_3Cl > CH_3Br$$

Solution

Question 6

$$CH_2Cl_2 < CHCl_3 < CCl_4$$

$$CH_2Cl_2 > CCl_4 > CHCl_3$$

$$CCl_4 < CH_2Cl_2 < CHCl_3$$

$$CH_2Cl_2 > CCl_4 < CHCl_3$$

Solution

Question 7

I alone

I and II

II and III

II and IV

Solution

Question 8

elimination

polymerisation

dimerisation

substitution

Solution

Question 9

its mass

the type of intermolecular and intramolecular forces of attraction

both mass and type of intermolecular and intramolecular forces of attraction

none of the above

Solution

Question 10

iodomethane

bromomethane

chloromethane

fluoromethane

Solution

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