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