Alkenes(Geometrical Isomerism: Mechanism of Electrophilic Addition: Addition of Hydrogen, Halogens,... ) NEET Questions

Organic Chemistry - Hydrocarbons

Alkenes(Geometrical Isomerism: Mechanism of Electrophilic Addition: Addition of Hydrogen, Halogens,... ) MCQ Questions


1.
Which of the following compounds shows geometrical (cis-trans) isomerism?
A.
2-Methylpropene ((CH3)2C=CH2)
B.
But-1-ene (CH2=CH-CH2-CH3)
C.
But-2-ene (CH3-CH=CH-CH3)
D.
Propene (CH3-CH=CH2)
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ANSWER :
C. But-2-ene (CH3-CH=CH-CH3)
2.
Geometrical isomerism is shown by alkenes because of:
A.
Difference in molecular masses
B.
Restricted rotation about the C=C double bond
C.
Presence of polar groups
D.
Free rotation about C=C bond
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ANSWER :
B. Restricted rotation about the C=C double bond
3.
In cis-but-2-ene, both methyl groups are:
A.
On the same side of the C=C double bond
B.
Trans to each other
C.
On the same carbon
D.
On opposite sides of the C=C double bond
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ANSWER :
A. On the same side of the C=C double bond
4.
The dipole moment of trans-but-2-ene is approximately zero because:
A.
It is a non-polar molecule with no dipoles
B.
It has no methyl groups
C.
Methyl groups are electronegative
D.
The two C-CH3 bond dipoles are equal and opposite, cancelling out
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ANSWER :
D. The two C-CH3 bond dipoles are equal and opposite, cancelling out
5.
Which one of the following will NOT show geometrical isomerism?
A.
Pent-2-ene
B.
1,2-Dichloroethene
C.
2-Methylbut-2-ene (CH3-C(CH3)=CH-CH3)
D.
Hex-3-ene
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ANSWER :
C. 2-Methylbut-2-ene (CH3-C(CH3)=CH-CH3)
6.
The cis isomer of an alkene is generally more polar than its trans isomer because:
A.
In cis form, similar polar bonds add up (do not cancel) due to same-side orientation
B.
Cis isomers are heavier
C.
Trans isomers have higher symmetry making them polar
D.
Cis isomers have stronger H-bonds
😑 View Answer Rough Work Error
ANSWER :
A. In cis form, similar polar bonds add up (do not cancel) due to same-side orientation