Organic Chemistry Some Basic Principles and Techniques Test

Result

Organic Chemistry Some Basic Principles and Techniques Test - 56

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

$${N}_{2}$$ is estimated in organic compound by

A
Duma's method

B
Carius method

C
Lassaigne's method

D
None of these

Solution

Duma's method can be used to estimate nitrogen in all type of organic compounds. Detection of nitrogen is done by Lassigne's test. Estimation of phosphorus is done by Carius method.
Question 2
1 / -0

Which is matched incorrectly?

A

B

C
Both (a) and (b)

D
None of the above
Question 3
1 / -0

The number of sigma $$\left( \sigma \right) $$ and $$\left( \pi \right) $$ bonds present in $$1, 3, 5, 7$$-octatetraene are __________ respectively.

A
$$14$$ and $$3$$

B
$$17$$ and $$4$$

C
$$16$$ and $$5$$

D
$$15$$ and $$4$$

E
$$16$$ and $$3$$

Solution

($$\because$$ Each single bond is a $$\sigma$$ bond and a double bond contains one $$\sigma$$ and one $$\pi$$ bond).

$$\therefore$$ The number of $$\sigma$$ and $$\pi$$ bonds are respectively $$17$$ and $$4$$.
Question 4
1 / -0

Which of the following do not contain carbon - oxygen double bonds?

A
Ketone

B
Esters

C
Acids

D
Ethers

Solution

Ethers do not contain carbon - oxygen double bonds. They contain $$C-O-C$$ linkages.
Question 5
1 / -0

Which of following can have vacant $$p-$$orbital?

A
$$^{ \bullet }{ C{ H }_{ 3 } }$$

B
$${ \overset { \oplus }{ CH } }_{ 3 }$$

C
$$CH_4$$

D
Both $$(B)$$ and $$(C)$$

Solution

Alkyl free radicals are either planar or pyramidal in structure, they have $$sp^{2}$$ hybridisation with impaired $$e^{-}$$ located primarily in $$p-$$orbital.
In $$CH_{3}$$, it has $$sp^{2}$$ hybridisation with two $$e^{-}$$ on each and one empty $$p-$$orbital.
In $$CH_{4}$$, every $$p-$$orbital is involved in hybridisation making it $$sp_{3}$$.
Question 6
1 / -0

Two compounds X and Y have the same molecular formula $$C_3H_6O$$. Identify the functional groups and structural formula of X and Y.

A
-CHO and -CO, X = $$CH_3CH_2CHO$$, Y = $$CH_3COCH_3$$

B
-CHO and -CO, X = $$CH_3CH_2OCH_3$$, Y = $$CH_3COCH_3$$

C
-CO and -COOH, X = $$CH_3COCH_3$$, Y = $$CH_3COOH$$

D
-CHO and -COOH, X = $$CH_3CH_2OCH_3$$, Y = $$CH_3CH_2COOH$$
Question 7
1 / -0

Number of $$\pi$$-bods in the following compound $$\dfrac{CH_3C \equiv CN}{3}$$

A
1

B
2

C
3

D
none

Solution
Question 8
1 / -0

What is NOT true for aceto-phenone?

A
It gives 2-4-DNP test

B
It forms $$C_{7}H_{6}O_{2}$$ on drastic oxidation with $$KMnO_{4}$$, H +

C
It does not give Tollen's or Fehling test

D
It gives yellow ppt. with $$NaOH$$, $$Cl_{2}$$
Solution
1. Acetophenone reacts with 2-4-DiNitroPhenylHydrazine test to form 2-4-DiNitroPhenylHydrazone.
2. On drastic oxidation with $$KMnO_4$$, $$H^+$$ acetophenone forms benzoic acid.
3. As acetophenone does not contain any hydrogen atom directly attached to the carbonyl carbon like aldehydes it does not give Tollen's or Fehling test.
4. Acetophenone reacts with $$NaOH$$, $$Cl_2$$ to form Chloroform which is colourless.
5. Therefore, option D is correct.
Question 9
1 / -0

Consider the following sequence of reactions, the end product B is:

A

B

C

D

Solution

On addition of $$Br_2$$ addition of Bromine at alkene takes place.
The product A thus formed is reacted with 1,2-dihydroxybenzene in presence of acetone to give product B.
Question 10
1 / -0

The derived name of the above compound is:

A
t-Butyl ethyl methyl carbinol

B
t-Butyl ethylethanol

C
t-Butyl ethyl methyl methanol

D
none of these

Solution