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1

NEET 2013

MCQ (Single Correct Answer)
Structure of the compound whose IUPAC name is 3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is
A
B
C
D

Explanation



IUPAC name of the structure is

3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid
2

NEET 2013

MCQ (Single Correct Answer)
The radical,

is aromatic because it has
A
7 p-orbitals and 7 unpaired electrons
B
6 p-orbitals and 7 unpaired electrons
C
6 p-orbitals and 6 unpaired electrons
D
7 p-orbitals and 6 unpaired electrons.

Explanation

In benzyl free radical it has 6 p orbitals, each containing one unpaired electron, in a six membered cyclic structure is in accordance with Huckel rule of aromaticity.

3

AIPMT 2012 Prelims

MCQ (Single Correct Answer)
Which nomenclature is not according to IUPAC system?
A
B
C
D

Explanation

In IUPAC nomenclature, preference is given to multiple bond than halogen substituent.
4

AIPMT 2011 Mains

MCQ (Single Correct Answer)
The IUPAC name of the following compound is

A
trans-2-chloro-3-iodo-2-pentene
B
cis-3-iodo-4-chloro-3-pentane
C
trans-3-iodo-4-chloro-3-pentene
D
cis-2-chloro -3-iodo-2-pentene.

Explanation



$$ \therefore $$ IUPAC name is trans-2-chloro-3-iodo-2-pentene.

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