Organic Chemistry " First "

20 Questions | By Medicalclub | Updated: Mar 22, 2022 | Attempts: 614

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Organic chemistry is a chemistry sub-discipline involving the scientific study of the structure, properties, and reactions of organic compounds and organic materials, that is, matter in its various forms that contain carbon atoms. Take the quiz below to measure your knowledge of basic organic chemistry. Give it a try and gauge yourself.

Questions and Answers

1.

Which of the following are constitutional isomers of trans-1,2 dimethylcyclopentane
- A.
  
  I,III ,IV
- B.
  
  II, IV ,V
- C.
  
  II, III ,V
- D.
  
  III, IV ,V
2.

Which is the IUPAC name for the following compound?
- A.
  
  2-ethyl-3methylpentane
- B.
  
  3,4-dimethylhexane
- C.
  
  2,3-diethylbutane
- D.
  
  3-methyl-4-ethylpentane
3.

Which structural formulas represent Cis forms of 1,2-dimethylcyclohexane?
- A.
  
  I , IV
- B.
  
  II , III
- C.
  
  III, IV
- D.
  
  I, II
4.

Which cycloalkanes show Cis-trans isomerization?
- A.
  
  I , V
- B.
  
  I , II , V
- C.
  
  II , III , V
- D.
  
  II , III , IV
5.

In the most stable conformation of trans-1,4-dimethylcyclohexane, what position do the mythel groub occupy?
- A.
  
  Axial , axial
- B.
  
  Equatorial , axial
- C.
  
  equatorial , equatorial
- D.
  
  Axial , equatorial
6.

Which compound has the highest boiling point ?
- A.
  
  A
- B.
  
  B
- C.
  
  C
- D.
  
  D
7.

What is a conformer of pentane?
- A.
  
  A
- B.
  
  B
- C.
  
  C
- D.
  
  D
8.

What is the term for the process of forming ethene (unsaturated hydrocarbon) from ethane( a saturated hydrocarbon)?
- A.
  
  Combustion
- B.
  
  Fractional distillation
- C.
  
  Thermal cracking
- D.
  
  Catalytic reformation
9.

Which of these diaxial forms has the highest energy ?
- A.
  
  A
- B.
  
  B
- C.
  
  C
- D.
  
  D
10.

How many secondary hydrogens are there in the following molecule?
- A.
  
  1
- B.
  
  2
- C.
  
  4
- D.
  
  9
11.

Which is the electronic configuration that describes Mg²⁺?
- A.
  
  1s2, 2s2
- B.
  
  1s2, 2s2, 2p6
- C.
  
  1s2, 2s2, 2p6, 3s2
- D.
  
  1s2, 2s2, 2p6, 3s2, 3p6
12.

Which atom is described by the electron configuration 1s²2s²2p⁶3s²3p⁵?
- A.
  
  S
- B.
  
  Se
- C.
  
  Cl
- D.
  
  Br
13.

Using the VSEPR model, predict which atoms have bond angles of about 120°.
- A.
  
  II, IV
- B.
  
  I, IV
- C.
  
  II, III
- D.
  
  I, III
14.

According to VSEPR model, what is your prediction for the arrangement of electron pairs for CH₃^-?
- A.
  
  Linear
- B.
  
  Tetrahedral
- C.
  
  Bent
- D.
  
  Trigonal
15.

Using the VSEPR model, predict which species have bond angles of about 109°
- A.
  
  I, III, IV
- B.
  
  II, III, V
- C.
  
  I, IV
- D.
  
  III, IV, V
16.

What is the formal charge of indicated carbon in
- A.
  
  -2
- B.
  
  -1
- C.
  
  0
- D.
  
  +1
17.

The carbon has the correct orbital hybridization in which structures?
- A.
  
  II, IV, V
- B.
  
  II, III, IV
- C.
  
  I, II, III
- D.
  
  I, IV, V
18.

. What are the correct orbital hybridizations for carbon in the following species?
- A.
  
  A and I, B and III
- B.
  
  B and I, C and II
- C.
  
  A and III, C and II
- D.
  
  B and III, C and III
19.

Which of the following are pairs of contributing resonance structures?
- A.
  
  II, IV
- B.
  
  I, II, III
- C.
  
  III, IV
- D.
  
  II, III, ,IV
20.

Carbon has how many valence electrons?
- A.
  
  2
- B.
  
  4
- C.
  
  6
- D.
  
  8