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Q:

What types of orbital overlap occur in Cumulene?

Answer

A cumulene is a hydrocarbon with three or more cumulative double bonds. They are analogous to allenes, only having a more extensive chain. The simplest molecule in this class is butatriene, which is also called simply cumulene.


 


The carbons on the ends are sp² hybridized, with a p-orbital for the 'second' bond in the double bond with their neighboring carbons.


They have those sp² orbitals overlapping with the s from the hydrogen, and they have a p overlapping in the pi bond with the neighboring carbon. They also have a sigma bond with the neighboring carbon I'll get to.


The middle carbons each have two pi bonds with their neighbors, leaving sp hybridiaztion for the rest. So they have sp/sp² with the end carbons, and sp/sp with each other. (And they also have p/p in the pi bonds).


 


All orbital overlappings in Cumuene are :


* s/sp²


* p/p


* sp/sp²


* sp/sp

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Q:

Which statement about PFD's is true?

A) PFDs are difficult to put on in the water B) Use gasoline to clean a PFD coated with oil or grease
C) PFDs do not float well in shallow water D) Children's PFDs should fit loosely
 
Answer & Explanation Answer: A) PFDs are difficult to put on in the water

Explanation:
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Q:

What substance gives plants their green color?

A) Chloroform B) Chlorine
C) Chlorophyll D) Caustic soda
 
Answer & Explanation Answer: C) Chlorophyll

Explanation:

Chlorophyll is the pigment that gives pant leaves their green color.

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Q:

The light reactions of photosynthesis supply the calvin cycle with

A) CO2and ATP B) ATP and NADPH
C) light energy D) H2O and NADPH
 
Answer & Explanation Answer: B) ATP and NADPH

Explanation:

The light reactions of photosynthesis supply the calvin cycle with ATP and NADPH.

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Filed Under: Biology
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Q:

The temperature at which water boils depends mainly on

A) Air Pressure B) Specific heat
C) Density D) Relative humidity
 
Answer & Explanation Answer: A) Air Pressure

Explanation:

The temperature at which water boils depends mainly on air pressure.

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Filed Under: Physics
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Q:

Cholesterol belongs to which class of molecules?

A) Lipids B) Carbohydrates
C) Nucleic acids D) Proteins
 
Answer & Explanation Answer: A) Lipids

Explanation:

Cholesterol belongs to lipids class of molecules. Lipids are sometimes called as fats which act as storing energy and structural components of cell membranes.

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Q:

Hub works on which layer?

A) Network layer B) Physical layer
C) Data link layer D) All of the above
 
Answer & Explanation Answer: B) Physical layer

Explanation:

Hub works on layer 1 i.e, physical layer.

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Q:

Core of earth is also known as

A) Barysphere B) Centrosphere
C) Besosphere D) Lithosphere
 
Answer & Explanation Answer: A) Barysphere

Explanation:

Core of earth is also known as Barysphere.

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