Class 11th

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(i) & (iii)

The halogens atom weakly deactivate the ring due to the -I effect and directs the incoming group to the ortho and para position due to the +R effect.

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(i) & (iv) The longest carbon chain is of 10 carbon atom

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(iii) & (iv) The longest carbon chain is of 10 carbon atom

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(iii) & (iv) When only the alkyl group is attached to the C atom of the C=C bond then only it would lead to giving only ketone on ozonolysis.

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(iii) & (iv) Methane is a controlled oxidation reaction that leads to giving formaldehyde and methanol.

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(iii) As the unburn carbon left out in this reaction thus it is an incomplete reaction

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(iv) The order of reactivity of β– elimination reaction is 3^o>2^o>1^o

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(ii) The electronegativity of sp hybridization is higher than that of sp³ hybridization.

The +I effect destabilizes the carbanion.

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(iii) The addition of alkyl halides to propene depends upon the H-X bond strength i.e. lesser the bond strength higher will be the reactivity of the alkyl halide. As down the group size of the halogens increases thus the bond strength decreases.

This is a multiple choice answer as classified in NCERT Exemplar

(iv) The two substituents attached to the same C atom of the C=C bond should be different to exhibit geometrical isomerisms.