Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 69

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is the correct priority order of functional groups:

A
$$-SO_{3} H>-COR > -CHO > -OH$$

B
$$-COOH >-SO_{3}H > -CN >-CONH_{2}$$

C
$$-CN >- CHO >- COR >-OH$$

D
$$-COOR > -COX > -CHO >-CN$$
Question 2
1 / -0

The highest boiling point is expected for

A
n-butane

B
n-pentane

C
iso - pentane

D
neo - pentane
Question 3
1 / -0

The mechanism of nucleophilic acyl substitution in the acyl derivative proceeds as follows
Among the above four steps, the slowest step is

A
step (i)

B
step (ii)

C
step (iii)

D
step (iv)

Solution
Question 4
1 / -0

Correct sequence of reagent for the following conversion

A
$$(i) \, (CH_3)_2CuLi \, (ii)PCC\, (iii) H_2/Pd/C$$

B
$$(i) \, (CH_3)_2MgBr\, (ii)PCC\, (iii) H_2/Pd/C$$

C
$$(i) \, (CH_3)Li \, (ii)PCC\, (iii) Na/liq.NH_3$$

D
$$(i)\, Ph_3P=CH_2 \, (ii) H^+,H_2O$$
Question 5
1 / -0

Which allylic carbocation is the most stable carbocation?

A
$$CH_{3}-CH=CH-CH_{2}$$

B
$$CH_{3}-CH=CH-CH-CH_{3}$$

C

D
All have same stabillty

Solution
Question 6
1 / -0

Which functional group has 'anol' suffix?

A
$$- C H O$$

B
$$- OH$$

C
$$- C OOH $$

D
none of these
Question 7
1 / -0

The functional groups which is not present in the given compound is:

A
Amide

B
Aldehyde

C
Amine

D
Ketone
Question 8
1 / -0

react with conc. $$H_2SO_4$$
Major product in following reaction is

A

B

C

D
Question 9
1 / -0

Which one of the following has the lowest boiling point ?

A
2- methylpropane

B
2- methylbutane

C
2,2-dimethylpropane

D
n-pentane

E
n-butane

Solution

Hint: The boiling point is directly proportional to the molecular mass of the compound.

Correct Answer: Option A

Explanation of Correct Options:
Molecular mass of $$2-methylpropane=CH_3CH(CH_3)CH_3 = C_4H_{10}=4(12)+10(1)=58g/mol$$
Molecular mass of $$2-methylbutane= CH_3CH(CH_3)CH_2CH_3=C_5H_{12}=5(12)+12(1)=72g/mol $$
Molecular mass of $$2,2-dimethylpropane=CH_3C(CH_3)_2CH_3 = C_5H_{12}=5(12)+12(1)=72g/mol$$
Molecular mass of $$n-pentane= CH_3CH_2CH_2CH_2CH_3=C_5H_{12}=5(12)+12(1)=72g/mol $$
Molecular mass of $$n-butane= CH_3CH_2CH_2CH_3=C_4H_{10}=4(12)+10(1)=58g/mol $$

Since $$2-methyl propane$$ and $$, n-butane$$ has the same molecular mass, and both have the lower boing point than the other two compounds.

Branching in a molecule decreases the boiling point it is by decreasing the surface area and also decreasing the attractive forces between the molecules, So, $$2-methylpropane$$ has the lowest boiling point.
Question 10
1 / -0

Which of the following alkenes have more value of heat of hydrogenation than _____________.

A

B

C

D

Solution