Hydrocarbons Test

Result

Hydrocarbons Test - 46

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Weekly Quiz Competition

Question 1
1 / -0

The number of sigma and pi bonds in benzene molecule is

A
$$6\sigma$$ and $$6\pi$$

B
$$12\sigma$$ and $$3\pi$$

C
$$6\sigma$$ and $$9\pi$$

D
$$9\sigma$$ and $$3\pi$$

Solution

The ratio of σ and π bonds in benzene is 4: 1. The molecular formula of benzene is $$C_6H_6$$ so there exists a double bond between alternating carbon atoms and each carbon is connected to two carbon atoms through a single bond and a double bond and hydrogen atom by a single bond.
12σ and 3π bonds is present in benzene molecule.
Question 2
1 / -0

The major product is :

A

B

C

D

Solution
Question 3
1 / -0

The carbide which gives propyne on hydrolysis:

A
$$Al_4C_3$$

B
$$Mg_2C_3$$

C
$$B_4C$$

D
$$La_4C_3$$

Solution

The hydrolysis of Magnesium Carbide ($$Mg_2C_3$$) gives out Propyne. The reaction involved is:
$$Mg_2C_3 + 4H_2O\to 2Mg(OH)₂ + C_3H_4$$ (Propyne)
Hence, option B is correct.
Question 4
1 / -0

The IUPAC name of the compound is

A
3, 3-dimethyl-1-cyclohexanol

B
1,1-dimethyl-3-hydroxy cyclohexane

C
3,3-dimethyl-1-hydroxy cyclohexane

D
1, 1-dimethyl-3-cyclohexane

Solution
Question 5
1 / -0

STATEMENT-1 : Alkanes float on the surface of water.
STATEMENT-2 : Density of alkanes is in the range of $$0.6 - 0.9\ g/ml$$, which is lower than water.

A
Statement -1 is True, Statement-2 True; Statement-2 is a correct explanation for Statement-1.

B
Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1

C
Statement-1 is True, Statement-2 is False

D
Statement-1 is False, Statement-2 is True

Solution

Density of alkanes is in the ranges of $$0.6 - 0.9\ g/ml$$, which is lower than water. Hence floats on water.

Option A is correct.
Question 6
1 / -0

Consider the following reaction

$$CH_3 - \underset{D}{\underset{|}{C}}H - \underset{CH_3}{\underset{|}{C}H} - CH_3 + \overset{\bullet}{Br} \to 'X'+ HBr$$,

$$X$$ can be:

A
$$CH_3 - \underset{D}{\underset{|}{C}}H - \underset{CH_3}{\underset{|}{C}H} - \overset{\bullet}{C}H_2 $$

B
$$CH_3 - \underset{D}{\underset{|}{C}}H - \underset{CH_3}{\underset{|}{\overset{\bullet}{C}} - } CH_3 $$

C
$$CH_3 - \underset{D}{\underset{|}{\overset{\bullet}{C}}} - \underset{CH_3}{\underset{|}{C}H} - CH_3 $$

D
$$CH_3 -\overset{\bullet}{C}H - \underset{CH_3}{\underset{|}{C}H} - CH_3 $$

Solution

$$CH_3 - \underset{D}{\underset{|}{C}}H - \underset{CH_3}{\underset{|}{\overset{\bullet}{C}} - } CH_3 $$ Most stable radical formed.

Option B is correct.
Question 7
1 / -0

IUPAC name of the compound

A
4-isopropyl-1-6-methyl octane

B
3-methyl-5-(1-methylethyl) octane

C
3-methyl-5-isopropyl octane

D
3-methyl-4-(1-methylethyl ) octane

Solution

IUPAC name of the compound is 3-methyl-5-(1-methylethyl) octane.
Question 8
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A hydrocarbon $$(R)$$ has six membered ring in which there is no unsaturation. Two alkyl groups are attached to the ring adjacent to each other. One group has $$3$$ carbon atoms with branching at $$1 ^{ st }$$ carbon and another has $$4$$ carbon atoms. The larger alkyl group has main chain of three carbon atoms of which second carbon is substituted. Correct IUPAC name of compound $$(R)$$ is

A
$$1-$$($$1-$$Methylethyl)$$-2-$$($$1-$$methylpropyl)cyclohexane

B
$$1-$$($$2-$$Methylethyl)$$-2-$$($$1-$$methylpropyl)cyclohexane

C
$$1-$$($$1-$$Methylethyl)$$-2-$$($$2-$$methylpropyl)cyclohexane

D
$$1-$$($$1-$$Methylethyl)$$-2-$$butylcyclohexane

Solution
Question 9
1 / -0

Total number of isomers of a disubstituted benzene compound is

A
$$1$$

B
$$2$$

C
$$3$$

D
$$4$$

Solution

There are $$3$$ isomers are possible.
Question 10
1 / -0

What will be the $$IUPAC$$ name of the given compound?

A
$$2,5-$$dimethyl$$-4-$$methylexane

B
$$3,4,6-$$trimethyloctane

C
$$2,5,6-$$trimethyloctane

D
$$3,5-$$trimethyloctane

Solution