For questions 15 choose all correct answers that apply Which

For questions 1-5 choose all correct answers that apply: Which of the following atoms has an electric configuration of 1s\' 2s2 2p? E. Fluorine A. Boron B. Carbon 2. What is the molecular shape and the hybridization of the carbon atom at position number 2 in hex-3-yn-2-one? B. Tetrahedral, sp C. Trigonal planar, sp A. Tetrahedral, sp D. Bent, sp E. Linear, sp AB. Trigonal pyramidal, sp 3. Which molecule(s) is/are a constitutional (structural) isomer(s) of cyclohexanol ? A. 2-Hexanone B. 2-Methylcyclopentanone C. 1-Methoxypentane D. Hexanoic acid E. Hexanal 4. Which of the following isomers will have the most exothermic heat of formation: B. C. D. E. 5. Which following molecule(s) has/have the S-stereochemistry? A. B. C. D. E.

Solution

1.

Total number of electrons = 6.
Carbon also has 6 electrons.
So, answer is option (B) carbon

2.

At position 2, it is a carbonyl carbon (since in name it is there 2-one).
And the carbonyl carbon is sp2 hybridized.
Answer is option (c) Trigonal planar, sp2

3.

Molecular Formula of cyclohexanol is: C6H12O

Molecular Formula of 2-Hexanone is: C6H12O
Molecular Formula of 2-methylcyclopentanone is: C6H10O
Molecular Formula of 1-methoxypentane is: C6H14O
Molecular Formula of hexanoic acid is: C6H12O2
Molecular Formula of hexanal is: C6H12O

Answer is option (A) and (E)

5.

Aswer is option (B)

Option (A) has R- configuration.
Option (C), (D) and (E) are not chiral.

4.

Answer is option (A).

Branching decreases the heat of formation.