Organic Chemistry Some Basic Principles and Techniques Test

Result

Organic Chemistry Some Basic Principles and Techniques Test - 54

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Which of the following is not o, pdirecting group

A
$$-NH_{2}$$

B
$$-OH$$

C
$$-X (halogens)$$

D
$$-CHO$$

Solution

$$\text{The presence of}$$ $$-CHO$$ $$\text{decreases electron density at o to p positions. Hence, the attack of an}$$ $$\text{electrophile occurs at m -position. therefore it is meta directing group.}$$
Question 2
1 / -0

Alkynes may be represented by the general formula:

A
$$ C_{n}H_{2n+2} $$

B
$$ C_{n}H_{2n-2} $$

C
$$ C_{n}H_{2n+1} $$

D
$$ C_{n}H_{2n-1} $$

Solution

Alkynes are carbon compounds containing one or more $$ C\equiv C $$ bonds. One can generalize the formula from the examples $$ C_{2}H_{2}, C_{3}H_{4} $$ etc.
Question 3
1 / -0

The decreasing order of priority for the following functional groups is:
I. $$-C\equiv N$$ II. $$-CONH_{2}$$ IV. $$-CHO$$

A
$$(II) > (I) > (IV) > (III)$$

B
$$(III) > (IV) > (I) > (II)$$

C
$$(I) > (II) > (IV) > (III)$$

D
$$(I) > (II) > (III) > (IV)$$

Solution
Question 4
1 / -0

Which of the following does not contain $$(-COOH)$$ group?

A
Asprin

B
Benzoic acid

C
Picric acid

D
All have $$(-COOH)$$ group

Solution

Picric acid is 2,4,6 trinitrophenol. It does not contain $$(COOH)$$ group.
Question 5
1 / -0

Glucose has functional group

A
Aldehydic

B
Aldehydic and alcoholic

C
Alcoholic

D
Ketonic and alcoholic

Solution

Glucose exists in a straight-chain form and in various cyclic forms. In the straight-chain form, the $$\text{functional group at C-1 is an aldehyde group.}$$ $$\text{The functional groups on C-2 to C-6 are alcohol groups.}$$ In the cyclic form, the functional group on C-1 is a hemiacetal group
Question 6
1 / -0

Which among the following is the strongest o, p-directing group

A
$$OH$$

B
$$Cl$$

C
$$C_{6}H_{5}$$

D
$$Br$$

Solution

Meta directing deactivators< Ortho-Para directing deactivators (halogens) < Ortho -Para directing Activators
*Activator -An atom or molecule capable of increasing electron density on benzene ring either by hyper conjugation or by mesomeric effect +R .
* Halogen are dectivator due -I effect so their reactivity is less than of benzene but Ortho-Para directing due to +R mesomeric effect.
*Deactivates decreases electron density on benzene ring so electrophile can attack on meta position with difficulty.
Now the order
(Meta directing deactivators)
$$-NO_2< -CN < -SO_3H < -COCH3 <-COOH < - COOCH_3 < -COH <$$
( OP deactivator)
$$-I < - Br < -Cl < -F <$$
(OP activators )
$$-H < -ph < -CH_3 < -COCH_3 < -N(CH_3)_3 < -OH < -NH_2$$
Hence option A $$-OH$$ is a correct answer.
Question 7
1 / -0

The decreasing order of priority for the following functional groups is:
I. $$-OH$$ II. $$-C\equiv C -$$ III. -OR IV. $$-NH_{2}$$.

A
$$(IV) > (I) > (II) > (III)$$

B
$$(IV) > (I) > (III) > (II)$$

C
$$(I) > (IV) > (III) > (II)$$

D
$$(II) > (III) > (IV) > (II)$$

Solution
Question 8
1 / -0

In which of the following compounds, -OH is the functional group?

A
Butanone

B
Butanol

C
Butanoic acid

D
Butanal

Solution

Compounds with -OH as functional group have 'ol' as suffix.
Question 9
1 / -0

The functional group present in propanol and propanal respectively are

A
$$-OH$$ and $$-CHO$$

B
$$-OH$$ and $$-COOH$$

C
$$-CHO$$ and $$-COOH$$

D
$$-CHO$$ and $$-CO$$

Solution

propanol is $$CH_3CH_2CH_2-OH$$ and propanal is $$CH_3CH_2-CHO$$.
Hence in propanol $$-OH$$ (alcohol) group is present and in propanal $$-CHO$$ (aldehyde) group is present.
Option A is correct.
Question 10
1 / -0

Prefix used for $$-COOH$$ functional group is :

A
Carbomayl

B
Carbonyl

C
Carboxy

D
Alkoxycarbonyl

Solution

Carboxy prefix is used for $$-COOH$$ group, as it has one carbonyl and one hydroxy group.