Explanation

 Newspaper, and paper products in general, can typically be recycled around 5 to 7 times

Before the fibers become too short and weak to be reused effectively in the recycling process.

Explanation

 Cyclohexane is an alicyclic compound. 

Alicyclic compounds are cyclic (meaning they form a ring) and saturated (meaning they only have single bonds between carbon atoms).

Cyclohexane fits this description as it is a six-membered ring with only single bonds connecting the carbon atoms. 

Explanation

Amphoteric nature​​ Aluminium oxide is an amphoteric substance, meaning it can react with both acids and bases

It is a chemical compound of aluminium and oxygen with the chemical formula Al2O3.

Explanation

 Angle in radians (θ) = Arc Length / Radius  

θ = 4 m / 2 m = 2 radians

So, the angle made at the center is 2 rad

Explanation

 In fructose, the functional group ketone is present on carbon number 2.

This is why fructose is classified as a ketohexose, a six-carbon sugar containing a ketone group. 

Explanation

The assembly of the 40S and 60S subunits of the ribosome creates an 80S unit. 

80S unit:

This is the complete functional ribosome in eukaryotic cells, composed of the smaller 40S subunit and the larger 60S subunit. 

Explanation

The most stable hydrocarbon among the given options is trans-2-butene. 

Stability in alkenes:

• The stability of alkenes is primarily determined by the degree of substitution at the double bond.
• More substituted alkenes are generally more stable. 

Trans vs. Cis Isomers:

• In the case of 2-butene, the trans isomer is more stable than the cis isomer.
• This is because in the trans configuration, the alkyl groups on either side of the double bond are oriented away from each other, minimizing steric hindrance.
• In the cis configuration, the alkyl groups are on the same side, leading to steric repulsion and less stability. 

Explanation

Acidified potassium permanganate (KMnO4), acidified potassium dichromate (K2Cr2O7), and silver nitrate (AgNO3 (in the form of Tollens' reagent) can all oxidize aldehydes to carboxylic acids. 

Acidified KMnO4:

• A strong oxidizing agent that readily converts aldehydes to carboxylic acids.
• It changes color from purple to colorless during the reaction. 

Acidified K2Cr2O7:

• Also a strong oxidizing agent that can oxidize aldehydes to carboxylic acids.
• It changes color from orange to green during the reaction. 

AgNO3 (in Tollens' reagent):

• A milder oxidizing agent compared to the previous two, but still capable of oxidizing aldehydes.
• It gives a characteristic silver mirror precipitate when reacting with an aldehyde. 

Explanation

CH₃MgBr is a Grignard reagent (a source of CH₃⁻ nucleophile).

CH₃O is shorthand for methanal (HCHO) or a methoxy group, depending on context.

Assuming the intended compound is an ester like methyl formate (HCOOCH₃), then:

CH₃MgBr reacts with an ester in two steps:

1. First addition forms a ketone.

2. The second addition gives a tertiary alcohol after hydrolysis.

So, the final product is a tertiary (3°) alcohol.

Explanation

Ozonolysis cleaves the double bond in 3-Ethyl-2-pentene, forming two carbonyl compounds.

The double bond is between C2 and C3:

CH3–CH=CH–CH(CH2CH3)–CH3

On ozonolysis, it breaks at the double bond, yielding:

- Ethanal (CH3CHO) from the CH= part

- 3-Pentanone (CH3COCH2CH2CH3) from the rest