1
MCQ (Single Correct Answer)

NEET 2013

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating ?
A
$$-$$COOH
B
$$-$$ NO2
C
$$-$$ C $$ \equiv $$ N
D
$$-$$ SO3H

Explanation

$$-$$ NO2 is most deactivating due to -I ans -M effect.
2
MCQ (Single Correct Answer)

NEET 2013

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
3
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.

4
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.

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