1
MCQ (Single Correct Answer)

### AIPMT 2011 Prelims

Considering the state of hybridization of carbon atoms, find out the molecule among the following which is linear ?
A
CH3 $-$ CH $=$ CH $-$ CH3
B
CH3 $-$ C$\equiv$C $-$ CH3
C
CH2 $=$ CH $-$ CH2 $-$ C$\equiv$CH
D
CH3 $-$ CH2 $-$ CH2 $-$ CH3

## Explanation

The carbon atoms which have sp hybridization form a linear molecule. Among the given compounds, has sp hybridized carbon atoms which has bond angle 180o are attached to sp3 hybridised carbon atoms. So, it is linear.
2
MCQ (Single Correct Answer)

### AIPMT 2010 Mains

Which of the following species is not electrophilic in nature?
A
$\mathop C\limits^ + l$
B
BH3
C
H3$\mathop O\limits^ +$
D
$\mathop N\limits^ +$O2

## Explanation

H3$\mathop O\limits^ +$ has a lone pair of electrons on oxygen atom, thus it is not an electrophile. Also the octet is complete
3
MCQ (Single Correct Answer)

### AIPMT 2010 Mains

The IUPAC name of the compound
CH3CH$=$CHC$\equiv$CH is
A
pent-4-yn-2-ene
B
pent-3-en-1-yne
C
pent-2-en-4-yne
D
pent-1-yn-3-ene

## Explanation

If a molecule contains both carbon-carbon double or triple bonds, those two are treated as per in seeking the lowest number combination. However, if the sum of numbers turns out to be the same starting from either of the carbon chain, then lowest number is given to the C = C double bond.
4
MCQ (Single Correct Answer)

### AIPMT 2010 Prelims

Which one of the following is most reactive towards electrophilic reagent?
A
B
C
D

## Explanation

+R effect of -OH group is greater than of -OCH3 group. That is why it is highly reactive towards electrophilic substitutions.

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