Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 43

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Weekly Quiz Competition

Question 1
1 / -0

(A)

A

B

C

D

Solution
Question 2
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$$\underset{\left( P \right)}{CH_3 - {\overset{CH_3}{\overset{|}C}}H - CH_3} \xrightarrow[hv]{Br_2}\underset{(major)} X \xrightarrow{LiAIH_4}\underset{(major)}Y$$
Which of the following is true for the above reaction sequence?

A
Y and P are same compounds

B
P is hydrogenated product of Y

C
Y is formed by nucleophilic substitution reaction

D
Both A and C

Solution

Isobutane on bromination gives $$2$$-bromo-$$2$$-methyl propane, which on reduction with $$LiAlH_4$$ gives back isobutane.
It is an example of nucleophilic substitution, where the attacking nucleophile is the $${H}^{-}$$ and the leaving group is $${Br}^{-}$$.
Question 3
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Number of products and number of fractions are respectively:
$$Ph-\underset{\underset{CH_3}{|}}{C}H-CH_2-CH_3\xrightarrow[hv]{Cl_2}products\xrightarrow[Distillation]{Fractional}Fractions.$$

A
$$6,5$$

B
$$6,4$$

C
$$5,4$$

D
$$6,3$$

Solution

$$Ph-CHCH_3-CH_2-CH_3 \xrightarrow [hv]{Cl_2} i) Ph-ClC^*-CH_3-CH_2CH_3$$ ($$2$$ products)
$$*=$$ chiral center
$$ii) Ph-CHCH_2Cl-CH_2-CH_3$$ ($$1$$ product)
$$iii) Ph-CHCH_3-CH^*Cl-CH_3$$ ($$2$$ products)
$$iv) Ph-CHCH_3-CH_2-CH_2Cl$$ ($$1$$ product)
$$\therefore$$ Total $$6$$ products and after fractional distillation $$4$$ fractions are obtained.
Question 4
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A group closely related compounds which can be expressed by a general formula & in which two consecutive members differ by $$14$$ in their molecular masses is called:

A
a heterogeneous series

B
a homologous series

C
a homogeneous series

D
a electrochemicals series

Solution

In homologous series, the two consecutive members will differ by 14 units in their molecular masses.
Ex-
Alkanes, Alkenes, Alkynes $$\rightarrow$$ Two consecutive units of any of the homologous series, (i.e., alkanes, alkenes, alkynes), are differ by 1 $$C{H}_{2}$$ unit or by 14 units in their molecular masses.
Question 5
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The major product of the given reaction is:

A

B

C

D

Solution
Question 6
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Which of the following does not form a stable hydrate on addition of $${ H }_{ 2 }O$$?

A

B

C

D

Solution

Cyclohexanone do not form a stable hydrate on addition of water as during the process, internal strain increases and also there is no driving force that would provide any special stabilization of its hydrate.
Question 7
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Which is the best leaving group?

A
$${N}_{2}$$

B
$${OH}^{-}$$

C
$${NH}_{2}^{-}$$

D
$${CH}_{3}CO{O}^{-}$$

Solution

$$N_2$$ is best leaving group among given. Best leaving group are self detachable. $$N_2$$ is self detachable.
Question 8
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If $$A,\ B$$ and $$C$$ are the major products of their respective reactions then $$'C'$$ is?

A

B

C

D
Question 9
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What is the major product of this reaction?

A

B

C

D

Solution
Question 10
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The mechanism of the reaction of propene with $$HOCl(Cl_{2}+H_{2}O)$$ will proceed through which of the following intermediates?

A
$$ CH_{ 3 }-\overset { \oplus }{ CH } -CH_{ 2 }OH$$

B
$$ CH_{ 3 }-\overset { \oplus }{ CH } -CH_{ 2 }Cl$$

C
$$ CH_{ 3 }-\overset { OH }{ CH } -\overset { \oplus }{ CH_{ 3 } }$$

D
$$ CH_{ 3 }-\overset { Cl }{ CH } -\overset { \oplus }{ CH_{ 2 } }$$

Solution