What is the correct IUPAC name of the following compound? A. 1, 4-dibromo-3-nitr

Question

What is the correct IUPAC name of the following compound? A. 1, 4-dibromo-3-nitrobenzene B. 1, 4-dibromo-2-nitrobenzene C. 2-nitro-1, 4-dibromobenzene D. 1-nitro-2, 5-dibromobenzene Which of the following ions are aromatic species? A. I and III B. II and III C. II and IV D. III and IV Acid-catalyzed dehydration of cis-2-phenylcyclopentanol gives A. 1-phenyteyclopentene. B. 4-phenylcyclopertone. C. phenylcyclopentane. D. 1-phenylcydopentanol Which one of the following compounds has the fastest S_N 1 reaction rate with H_2 O in acetone? A) I B) II C) III D) IV The reaction of phenylmagnesium bromide (C_8 H_5 MgBr) with propanol (CH_3 CH_2 CH = O), followed by hydrolysis yields A. 2-phenyl-1-propanol. B. 1-phenyl-1-propanol. C. 2-phenyl-2-propanol. D. 3-phenyl-1-propanol. What is the product of the following sequence of reactions? A) 1, 1-dithyleyclopropane B) trans-1, 2-diethylcyclopropane C) cis-1, 2-diethylcyclopropane D) cis and trans-1, 1-diiodo-2, 3-diethylcyclopropane

Explanation / Answer

9)
-No2 has least priority
Br at the botom will be numbered 1 and the other Br as 4
and No2 will be numbered 2
SO, The IUPAC name will be:
1,4-dibromo-2-nitrobenzene
Answer: B

10)
to decide aromatic:
all the atoms in the ring should be in the same plane (SP2 hybridised)
it should follow 4n+2 rule
Based on this aromatic compounds are II and III
Answer: B

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