The IUPAC name of  CH₃CH=CHC≡CH is:

1. Pent - 3 - en - 1 - yne

2. Pent - 2 - en - 4 - yne

3. Pent - 1 - yn - 3 - ene

4. Pent - 4 - yn - 2 – ene

The species among the following that is not an electrophile is:

1. $B{H}_3$

2. $H_3\stackrel{\oplus }{O}$

3. $\stackrel{\oplus }{N}{O}_2$

4. $\stackrel{\oplus }{Cl}$

The IUPAC name of the above-mentioned compound is:

1. cis-2-Chloro-3-iodo-2-pentene
2. trans-2-Chloro-3-iodo-2-pentene
3. cis-3-Iodo-4-chloro-3-pentene
4. trans-3-Iodo-4-chloro-3-pentene

Polarisation of electrons in acrolein may be written as:

1.  $\stackrel{+\delta }{C}{H}_2=CH-\stackrel{-\delta }{C}HO$

2.  $\stackrel{-\delta }{C}{H}_2=CH-\stackrel{+\delta }{C}HO$

3.  $\stackrel{-\delta }{C}{H}_2=CH-\stackrel{}{C}\stackrel{+\delta }{H}O$

4.  $\stackrel{+\delta }{C}{H}_2=CH-CH\stackrel{-\delta }{O}$

The correct order of –I effect is:

1. -NR₃⁺ > -OR  > -F

2. -F > -NR₃⁺ > -OR  

3.-NR₃⁺ > -F  > -OR  

4. -OR  > -NR₃⁺ > -F

The correct order of stability is:

IUPAC  name of  is: 

1. 2-Chloro-3-iodo-2-pentene

2. 2-Chloro-3-iodo-3-pentene

3.  2-Iodo-3-chloro-pentene

4.  None of the above

2-butene shows geometrical isomerism due to:

1. Restricted rotation about double bond

2. Free rotation about double bond

3. Free rotation about single bond

4. Chiral carbon

Dihedral angle in staggered form of ethane is:

1. $0°$

2. $120°$

3. $60°$

4. $180°$

Which of the following is most reactive towards electrophilic substitution reaction?

1.		2.
3.		4.