Which choice provides the IUPAC name of this structure? (A) 4-ethylheptanal ethe

Question

Which choice provides the IUPAC name of this structure? (A) 4-ethylheptanal ether (B) 5-ethoxy-5-propylpentanal (C) 5-etboxyoctanal (D) 7-methyl-5-ethoxyoctanal 2. What structure has a parent name heptane? (A) CH_3(CH_2)_2CH(CH_3)CH_2(CH_3)_3 (B) (CH_3)_3C(CH_2)_3CH(CH_3)CH_2CH_3 (C) CH_3(CH_2)_2C(CH_3)_2CH=CHCH_2CH_3 (D) (CH_3)_2CHCH(CH_3)CH(CH_3)_2 3. Which statement is false for a compound with molecular formula C_3H_4? (A) It may have two double bonds. (B) It may have one ring and one double bond. (C) It may have one triple bond. (D) It may have one double bond and one triple bond. 4. Which species is the most likely to undergo a 1, 2-hydride shift? 5. What orbital overlap to form the indicated C-C bond? (A) sp^3 - sp^2 (B) sp^2 - sp^2 (C) sp^2 - sp (D) sp - sp^3 6. Which best represents the ground stale HOMO for butadiene? 7. Which alkane has the lowest boiling point? 8. Which compound(s) would be expected to be polar (have a dipole moment > 0 D)?

Explanation / Answer

1. (C) 5-ethoxyoctanal

2. (A)

3 (D)    (other options are true)

4 (B) Because it has hydrogen at benzylic position which under go 1,2 hydride shift to give tertiary benzylic carbocation.

5 (A) sp3-sp2

6 (B) there should be 2 nodes in HOMO.

7 (B)

This is due to the fact that branching of the chain makes the molecule more compact and thereby decreases the surface area. Therefore, the intermolecular attractive forces which depend upon the surface area, also become small in magnitude on account of branching.

8 (C) as these are non symmetric.

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