PART (3pts ea) PLEASE CIRCLE ONLY ONE BESTANSWER 1. Which one is a terminal alky
ID: 1066991 • Letter: P
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PART (3pts ea) PLEASE CIRCLE ONLY ONE BESTANSWER 1. Which one is a terminal alkyne? 3Methyl-1-pentyne A) 3-Hexyne B) 2-Hexyne D) 2-Methyl-3-pentyne 2. Which of the following is the weakest acid? OCH D) IV E) V 3. What are the hybridizations of the carbon atoms numbered 1 and 2 respectively in the following structure? CH CH C CH A) sp3, sp2 B) sp2, sp2 D) sp2, sp E) sp, sp2 4. Which of the following statements is not true about propyne, HC"C-CH3? A) It contains six sigma bonds. B) It contains three pi bonds. C)The H-C-H bond angle is about 109.5 D) The C-C-C bond angle is 180 E) The pi bond is weaker than the sigma bond. 5. What two atomic orbitals or hybrid atomic orbitals overlap to form the carbon-carbon o bond in ethyne? A) sp3-sp3 c) sp2-sp2 B) p-p D) s-s E) sp-sp 6. Which is the correct order of decreasing acidity in the following compounds? CH3CH3 CH2 CH2 HCECH A) A C B 7. The pi-bonds in ethyne is formed by A) end-to-end sp-sp overlap B) side-to-side sp-sp overlap end-to-end s-sp overlap D) end-to-end p-p overlap E) side-to-side p-p overlap 8. Keto-enol forms are A) resonance structures B) enantiomers C disatereomers D) constitutional isomers 9. In the hydroboration-oxidation reaction of a terminal alkyne, the final product is a(n) B) aldehyde E) alcohol A) alkyne ketone D)enol 10. Which of the following statements about benzene is correct? A) All of the carbon atoms are sp3 hybridized. B) It has no delocalized electrons. C)The carbon-carbon bond length is longer than that of ethane. D) It is a planar molecule. E) The carbon-hydrogen bonds are not the same length.Explanation / Answer
1)
terminal alkyne should have triple bond at the 1st carbon
Answer: C
2)
I is weakest acid because +M of -OCH3 decreases the stability of anion formed after removal of H+
Answer: A
3)
1 forms 3 sigma bond. Hence it is sp2
2 forms 2 sigma bond. Hence it is sp
Answer: D
4)
It has only 2 pi bonds. The triple bond only which has 2 pi bonds
Answer: B
I am allowed to answer only 1 question at a time
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