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Identify the compound which is a polyhalogen derivative of methane.
Methane is CH$_4$. CH$_2$Cl$_2$ (dichloromethane) contains two halogen atoms and is therefore a dihalogen compound, which falls under the broader category of polyhalogen compounds.
Which of the following IUPAC names represents a polyhalogen compound?
1,2-Dibromoethane contains two bromine atoms, making it a dihalogen compound, and thus a polyhalogen compound. The others are monohalogen compounds.
The general formula for a homologous series of alkyl halides is:
The NCERT text states that alkyl halides form a homologous series represented by '$C_nH_{2n+1}X$'.
Why are the boiling points of organohalogen compounds comparatively higher than the corresponding hydrocarbons?
The NCERT text explains: 'The boiling points of organohalogen compounds are comparatively higher than the corresponding hydrocarbons because of strong dipole-dipole and van der Waals forces of attraction.'
Chloramphenicol, a chlorine-containing antibiotic, is produced by microorganisms and is effective for treating:
The NCERT text mentions: 'Chlorine containing antibiotic, chloramphenicol, produced by microorganisms is very effective for the treatment of typhoid fever'.
What is the classification of dihalo-compounds where both halogen atoms are present on the same carbon atom of the aliphatic chain?
The NCERT text states: 'The dihalo-compounds having both the halogen atoms are further classified as geminal halides or gem-dihalides when both the halogen atoms are present on the same carbon atom of the aliphatic chain.'
Many volatile halogen compounds possess what distinct physical property?
The NCERT text states: 'Many volatile halogen compounds have sweet smell.'
Which of the following describes the process where cells derived from meristems mature to perform specific functions, undergoing structural changes in cell walls and protoplasm?
The context states: 'The cells derived from root apical and shoot-apical meristems and cambium differentiate and mature to perform specific functions. This act leading to maturation is termed as differentiation. During differentiation, cells undergo few to major structural changes both in their cell walls and protoplasm.'
Which of the following is an example of structural changes observed during differentiation of a tracheary element?
The context states: 'For example, to form a tracheary element, the cells would lose their protoplasm. They also develop a very strong, elastic, lignocellulosic secondary cell walls, to carry water to long distances even under extreme tension.'
Which of the following plant structures are formed through dedifferentiation from fully differentiated parenchyma cells?
The context provides an example: 'For example, formation of meristems – interfascicular cambium and cork cambium from fully differentiated parenchyma cells.' Vascular cambium is mentioned as a lateral meristem in another section, contributing to secondary growth which involves processes like dedifferentiation and redifferentiation.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.