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Structural and Physical Properties of Carbonyls

1.For symmetr...

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1.For symmetrical alkenes/alkynes ,we can add the negative and positive part of the reagent to any of the double/triple bonded carbon atoms.Markovnikov's rule does not apply to such alkenes and alkynes.Is this correct?

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I

. The formulas of ethane, ethyne and ethene are

C_{2} H_{6}, C_{2} H_{4}

C_{2} H_{2}

I I

. Alkanes contain only

C - C

C - H

bonds, alkenes may contain triple bonds between carbon atoms and alkynes may contain double bonds between carbon atoms.

Q. What are the minimum number of carbon atoms required for alkanes, alkenes and for alkynes to exhibit positional isomerism respectively?

Q. Rewrite the following choosing the correct word from each pair given in brackets:
The hydrocarbons containing at least one carbon to carbon _______________ (double/triple) bond are called __________ (alkenes/alkynes). They have the general formula

C_{n} H_{2 n}

. These were previously called ______________ (olefins/paraffins). When this compound is treated with ____________ (bromine/lime) water, decolourisation occurs because it is ____________ (saturated/unsaturated).

Q. Match the following:

\begin{matrix} (a)Tetravalency & (i) A t o m s o f t h e s a m e e l e m e n t l i n k s t o f o r m l o n g c h a i n c o m p o u n d s . (b)Saturated hydrocarbons & (i i) A l k e n e s a n d A l k y n e s (c)Catenation & (i i i) A l k a n e s (d)Unsaturated hydrocarbons & (i v) A b i l i t y o f c a r b o n t o b o n d w i t h c a r b o n o r 4 o t h e r m o n o v a l e n t a t o m s o r t w o o t h e r d i v a l e n t a t o m s \end{matrix}

Q. Assertion :Alkenes and alkynes are more reactive than alkanes. Reason: Alkenes and alkynes possess multiple bonds.

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Structural and Physical Properties of Carbonyls

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