1
MCQ (Single Correct Answer)

NEET 2013

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.

2
MCQ (Single Correct Answer)

AIPMT 2012 Prelims

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.
3
MCQ (Single Correct Answer)

AIPMT 2011 Mains

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.
4
MCQ (Single Correct Answer)

AIPMT 2011 Mains

Which of the following compounds undergoes nucleophilic substitution reaction most easily?
A
B
C
D

Explanation

Electron withdrawing group like -NO2 facilitates nucleophilic substitution reaction in chlorobenzene.

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