Practice Organic chemistry - general science mcq Online Quiz (set-1) For All Competitive Exams

Q-1)   How many different isomers are possible for a hydrocarbon with the molecular formula C4H10?

(a)

(b)

(c)

(d)

Q-2)   Which of the following has maximum density?

(a)

(b)

(c)

(d)

Q-3)   The general formula CnH2nO2 could be for open chain

(a)

(b)

(c)

(d)

Explanation:

General formula

Q-4)   Which of the following contains carbonyl group?

(a)

(b)

(c)

(d)

Explanation:

All contains carbonyl compounds.

Q-5)   Butanone is a four-carbon compound with the functional group

(a)

(b)

(c)

(d)

Q-6)   Match List-I with List-II :
List-I List-II
A. Sour milk 1. Malic acid
B. Vinegar and pickle 2. Carbonic acid
C. Soda water 3. Acetic acid
D. Apple 4. Lactic acid
Select the correct answer from the codes given below: (A) (B) (C) (D)

(a)

(b)

(c)

(d)

Explanation:

  1. Sour milk – Lactic acid
  2. Vinegar and pickel – Acetic acid
  3. Soda water – Carbonic acid
  4. Apple – Malic acid

Q-7)   Which of the following are considered as a base?
  1. Proton Donor
  2. Proton Acceptor
  3. Electron Acceptor
  4. Electron Donor
Choose the correct option:

(a)

(b)

(c)

(d)

Explanation:

The base is a proton acceptor and Electron Donor. Bases give up hydroxide ion (OH–) that wants to bond to the hydrogen ion (H+) given by an acid.

Whereas Lewis bases are those compounds which are capable of donating a lone pair of electrons.

Q-8)   Identify the enzyme which converts glucose to ethyl alcohol.

(a)

(b)

(c)

(d)

Q-9)   Which of the following are examples of addition polymers?
  1. Polystyrene
  2. Nylon
  3. PVC
  4. Polypropylene
Choose the correct option from the codes given below:

(a)

(b)

(c)

(d)

Explanation:

Nylon is a condensation polymer.

Q-10)   Which of the following are true statements?
  1. α-Carbon of α-amino acid is asymmetric.
  2. All proteins are found in L-form.
  3. Human body can synthesize all proteins they need.
  4. At pH = 7 both amino and carboxylic groups exist in ionised form.

(a)

(b)

(c)

(d)

Explanation:

All proteins are not found in L-form but they may be present in form of D or L

Q-11)   The IUPAC name of CH3CH2COCl is

(a)

(b)

(c)

(d)

Q-12)   Which of the following can be used distinguish between ethane and ethene?

(a)

(b)

(c)

(d)

Q-13)   Which among the following are unsaturated hydrocarbons?
  1. $H_3C - CH_2 - CH_2 - CH_3$
  2. $H_3C - C ≡ C - CH_3$
  3. $H_3C - {CH} ↙{|} ↙{CH_3} - CH_3$
  4. $H_3C - {CH} ↙{|} ↙{CH_3} = CH_3$

(a)

(b)

(c)

(d)

Explanation:

Unsaturated hydrocarbons have double or triple bond.

Q-14)   The heteroatoms present in CH3 — CH2 — O — CH2— CH2 Cl are
  1. Oxygen
  2. Carbon
  3. Hydrogen
  4. Chlorine

(a)

(b)

(c)

(d)

Explanation:

Q-15)   While cooking, if the bottom of the vessel is getting blackened on the outside, it means that

(a)

(b)

(c)

(d)

Q-16)   Match Column-I with Column-II :
Column-I Column-II
A. Carbon black P. Water filters
B. Diamond Q. Fuel
C. Coke R. Jewellery
D. Charcoal S. Filler in automobiles
Select the correct answer from the codes given below: (A) (B) (C) (D)

(a)

(b)

(c)

(d)

Explanation:

Q-17)   ‘Drinking alcohol’ is very harmful and it ruins the health. ‘Drinking alcohol’ stands for:

(a)

(b)

(c)

(d)

Q-18)   Which of the following is incorrectly matched?

(a)

(b)

(c)

(d)

Explanation:

Methanol is an alcohol.

Q-19)   Which of the following has shortest carbon-carbon bond length?

(a)

(b)

(c)

(d)

Q-20)   Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?

(a)

(b)

(c)

(d)

Explanation:

Carbon, hydrogen and nitrogen were primarily responsible for the origin of life on the earth.