Multiple choice Circle the best answer. (3 pt ca) In what type of orbital is the

Question

Multiple choice Circle the best answer. (3 pt ca) In what type of orbital is the lone pair found in pyridine? sp sp^2 sp^3 s p Which of the following is the most acidic? Which structure is most stable? What is (are) the expected product(s) of this reaction? H_2C = CHCH(CH_2)_2 + NBS Predict the major organic product in the following reaction. Which of the following is an electron donating group overall? -CCI_3 -NHCOCH_3 -CN -NO_2 - SO_3H Arrange the following compounds in increasing order of their reactivity to electrophiles (least reactive first). Benzaldehyde anisole bromobenzene toluene A

Explanation / Answer

1). Answer is (b) sp2

Lone pair is on nitrogen atom of pyridine.

2).

3). Answer is (a) CH3CH2CH2C+=CH2

All are secondary carbocation, but only in (a) the positive charge is on carbon with  sp2 hybridization.

4). Answer is (c) Compound C

NBS gives allylic bromination.

5). Answer is (a)

Fridel-Craft alkylation.

6). Answer is (b) -NHCOCH3.

7). Answer is (a)

Tolene is more reactive that bromobenzene towards electrophilic substitution reaction.

8). Answer is (d)

Resonance structures and hybrid resonance structure.

9).  Answer is (a)

In Diel's Alder reaction, better electron withdrawing group will make the reaction faster.

Increasing the HOMO of diene (attaching electron donating groups) and decreasing LUMO of dienophile (attaching electron withdrawing groups) makes reaction faster.

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