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


13.
In ethene molecule, the C=C bond consists of:
A.
One σ bond by sp²-sp² overlap and one π bond by p-p sideways overlap
B.
Two σ bonds
C.
One σ and two π bonds
D.
Two π bonds
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ANSWER :
A. One σ bond by sp²-sp² overlap and one π bond by p-p sideways overlap
14.
The bond length of C=C double bond in ethene is:
A.
120 pm
B.
110 pm
C.
154 pm
D.
134 pm
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ANSWER :
D. 134 pm
15.
Why are alkenes more reactive than alkanes?
A.
Because they are less stable
B.
Because of weaker π bond which provides loosely held mobile electrons
C.
Because they contain more hydrogens
D.
Because of stronger σ bonds
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ANSWER :
B. Because of weaker π bond which provides loosely held mobile electrons
16.
The hybridization of doubly-bonded carbon atoms in ethene is:
A.
sp³d
B.
sp
C.
sp²
D.
sp³
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ANSWER :
C. sp²
17.
The H-C=C bond angle in ethene is approximately:
A.
121.7°
B.
90°
C.
180°
D.
109.5°
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ANSWER :
A. 121.7°
18.
Alkenes are attacked by reagents which are:
A.
Nucleophilic (electron-rich)
B.
Electrophilic (electron-seeking)
C.
Acidic protons only
D.
Free radicals only
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ANSWER :
B. Electrophilic (electron-seeking)