Ncert Exercises & Solutions

For carbon hydrides of type

C_{n} H_{2 n + 2}

, the following hydrides are possible for

n = 1 \Rightarrow C H_{4}

n = 2 \Rightarrow C_{2} H_{6}

n = 3 \Rightarrow C_{3} H_{8}

For a hydride to act as a Lewis acid i.e., electron accepting, it should be electrondeficient. Also, for it to act as a Lewis base i.e., electron donating, it should be electronrich. Taking $C_{2} H_{6}$ as an example, the total number of electrons are 14 and the total covalent bonds are seven. Hence, the bonds are regular 2e– -2 centered bonds.

Hence, hydride $C_{2} H_{6}$ has sufficient electrons to be represented by a conventional Lewis structure. Therefore, it is an electron-precise hydride, having all atoms with complete octets. Thus, it can neither donate nor accept electrons to act as a Lewis acid or Lewis base.

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