Aldehydes and ketones are converted into alkenes by means of a direct nucleophilic addition called the Wittig reaction, In the reaction, a triphenylphosphorine ylide, also called a phosphorane, adds to an aldehyde/ketone to give a four-membered cyclic intermediate called an is not isolated but instead spontaneously decomposes to release triphenylphosphine oxide and an alkene The ylide is formed by reaction of triphenylphosphine, a good nucleophile, with a primary alkyl halide in an Sy2 reaction, followed by deprotonation of the carbon with a strong base, such as butylithium. The carbonyl carbon and the carbon originally bonded to the halogen become the two carbons with the double bond in the product alkene The real value of the Wittig reaction lies in its ability to yield an alkene of predictable structure, as the c-c bond is precisely where the C bond was in the reactant and no isomers (other than E/Z isomers) are formed Draw curved arrows to show the movement of electrons in this step of the mechanism.

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.

the objects have the same charge.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.