Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 51

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Weekly Quiz Competition

Question 1
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Which of the following is an example of nucleophilic addition reaction?

A
${\text{CH}} \equiv {\text{CH}} + {\text{C}}{{\text{l}}_{\text{2}}}\xrightarrow{{}}{\text{CHCl = CHCl}}$

B
${\text{HC}} \equiv {\text{CH}}\xrightarrow[{{\text{C}}{{\text{H}}_3}{\text{COOH}}}]{{{\text{HCl}}}}{\text{C}}{{\text{H}}_2}{\text{ = CHCl}}$

C
${\text{HC}} \equiv {\text{CH}} + {{\text{H}}_{\text{2}}}{\text{O}}\xrightarrow[{{\text{H}}{{\text{g}}^{2 \oplus }},\Delta }]{{{{\text{H}}^ \oplus }}}{\text{C}}{{\text{H}}_3} - {\text{CO}} - {\text{H}}$

D
${\text{H}} - {\text{C}} \equiv {\text{C}} - {\text{H}}\xrightarrow{{{\text{NaN}}{{\text{H}}_2}}}{\text{HC}} \equiv {{\text{C}}^{( - )}}{\text{N}}{{\text{a}}^ \oplus }$

Solution
Question 2
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The most reactive of C-X bond towards nucleophile in the following compound is

A

B

C
$(CH_3)_3C-X$

D
$(CH_3)_2CH-X$

Solution
Question 3
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Which of the following reactions give same product

A

B

C

D
Question 4
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In the given compound which functional group is absent ?

A
Ketone

B
Ether

C
Amide

D
Ester

Solution
Question 5
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Which of the following is correct for hydbridization of C-atom?

A
$CH_{4}-SP^{3}$

B
$C_{2}H_{4}-sp^{2}$

C
$C_{2}H_{2}-sp$

D
All of these

Solution

CH4− Alkane SP3

C2H4- Alkene SP2
C2H2- Alkyne SP

Hence all hybridization of carbon are correct
Question 6
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Which of the following has highest bond strength?

A
$$
2 p \pi-2 p \pi
$$

B
$$
2 p \pi-3 p \pi
$$

C
$$
3 d \pi-3 d \pi
$$

D
$$
1 s-2 p
$$
Question 7
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$H - \underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}} - \underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}} - \underset{\!\!OH}{\underset{|}{\overset{H}{\overset{|}{C}}} - }H$ $H - \underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}} - \underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}} - OH$ $H - \underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}} - \underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}} - H$ $\underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}} = \underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}}$

$(1)$ $(2)$ $(3)$ $(4)$

The structures of four molecules are shown.

Which molecules belong to the same homologous series?

A
$1$ and $2$

B
$1$ and $3$

C
$2$ and $4$

D
$3$ and $4$

Solution

Molecules $1$ and $2$ contain the same functional group, i.e., alcohol, and their formula differs by $CH_2$ group. Thus belongs to the same homologous series while compound $3$ and $4$ belongs to alkane and alkene respectively.
A homologous series is a group or class of compounds having the same general formula and similar chemical properties in which successive members differ by $-CH_2$ group.
Hence, option A is correct.
Question 8
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Ammonia and chlorine react together in the gas phase.
$8NH_3+3Cl_2\rightarrow N_2+6NH_4Cl$
Which statements are correct?
$1$ . Ammonia behaves as a reducing agent.
$2$ . Ammonia behaves as a base.
$3$ . The oxidation number of hydrogen changes.

A
$1, 2$ and $3$ are correct

B
$1$ and $2$ only are correct

C
$2$ and $3$ only are correct

D
$1$ only is correct

Solution

$\text{Ammonia behaves as a reducing agent as it donates its lone pair electron.}$
$\text{Ammonia reacting as Brownsted acid.}$
$\text{Oxitation number of hydrogen is not changes.}$
Question 9
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Product

A

B

C

D

Solution
Question 10
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In which of the following func-tional group isomerism is not possible?

1) Alcohols
2) Aldehydes
3) Alkyl halides
4) Cyanides

A
$1, 2, 3$ and $4$ are correct

B
$1$ and $2$ only are correct

C
$2$ and $3$ only are correct

D
$3$ only is correct

Solution

$\text{Alkyl halides does not have any functional group.}$