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