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What is the common name for $CH_3OCH_3$?
According to Table 7.2 in the NCERT, the common name for $CH_3OCH_3$ is Dimethyl ether.
Alcohols and phenols are considered Brönsted acids because:
The NCERT states, 'In fact, alcohols and phenols are Brönsted acids i.e., they can donate a proton to a stronger base (B:).'
Among the following, which ether is typically described as symmetrical?
The NCERT states, 'Ethers are classified as simple or symmetrical, if the alkyl or aryl groups attached to the oxygen atom are the same... Diethyl ether, $C_2H_5OC_2H_5$, is a symmetrical ether'.
The acidic strength of alcohols decreases in the order of primary > secondary > tertiary. This is primarily due to:
The NCERT explains, 'The acidic character of alcohols is due to the polar nature of O–H bond. An electron-releasing group (–CH3, –C2H5) increases electron density on oxygen tending to decrease the polarity of O-H bond. This decreases the acid strength. For this reason, the acid strength of alcohols decreases in the following order: Primary > Secondary > Tertiary.'
Which of the following classes are grouped under Tetrapoda based on the presence of two pairs of limbs?
As per the NCERT text: 'Classes, Amphibia, Reptilia, Aves and Mammalia have two pairs of limbs and are thus grouped under Tetrapoda.'
Amphibians are characterized by their adaptation to live in which environments?
The context states: 'The amphibians have adapted to live both on land and water.'
Which of the following is true regarding the heart structure in Amphibia?
The NCERT text mentions: 'The heart is three-chambered (two auricles and one ventricle)' for Amphibia.
Amphibians are classified as poikilothermous animals. What does 'poikilothermous' mean?
The text states: 'Fishes, amphibians and reptiles are poikilothermous (cold-blooded).'
Identify the characteristic feature of reproduction and development in amphibians.
The provided text indicates for Amphibia: 'Sexes are separate. Fertilisation is external. They are oviparous and development is indirect.'
In amphibians, what common chamber do the alimentary canal, urinary, and reproductive tracts open into?
According to the NCERT text: 'Alimentary canal, urinary and reproductive tracts open into a common chamber called cloaca which opens to the exterior.'
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