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10
MCQ (Single Correct Answer)

Correct IUPAC name for

is ........... .

A
2-ethyl-3-methylpentane
B
3,4-dimethylhexane
C
2-sec-butylbutane
D
2, 3-dimethylbutane
11
MCQ (Single Correct Answer)

In which of the following compounds the carbon marked with asterisk is expected to have greatest positive charge?

A
  ${ }^* \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{Cl}$
B
${ }^* \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{Mg}^{+} \mathrm{Cl}^{-}$
C
$* \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{Br}$
D
$* \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_3$
12
MCQ (Single Correct Answer)

Ionic species are stabilised by the dispersal of charge. Which of the following carboxylate ion is the most stable?

A
B
C
D
13
MCQ (Single Correct Answer)

Electrophilic addition reactions proceed in two steps. The first step involves the addition of an electrophile. Name the type of intermediate formed in the first step of the following addition reaction. $$\mathrm{H}_3 \mathrm{C}-\mathrm{HC}=\mathrm{CH}_2+\mathrm{H}^{+} \longrightarrow \text { ? }$$

A
$2^{\circ}$ carbanion
B
$1^{\circ}$ carbocation
C
$2^{\circ}$ carbocation
D
$1^{\circ}$ carbanion
14
MCQ (Single Correct Answer)

Covalent bond can undergo fission in two different ways. The correct representation involving a heterolytic fission of $\mathrm{CH}_3-\mathrm{Br}$ is

A
B
C
D