NEET Chemistry Chemical Bonding and Molecular Structure / रासायनिक आबंधन एवं आणविक संरचना NEET PYQ-Chemical Bonding Molecular

  • question_answer
    In the hydrocarbon                                                                                                                      [AIPMT (S) 2008] \[\underset{6}{\mathop{C{{H}_{3}}}}\,-\underset{5}{\mathop{CH}}\,=\underset{4}{\mathop{CH}}\,-\underset{3}{\mathop{C{{H}_{2}}}}\,-\underset{2}{\mathop{C}}\,\equiv \underset{1}{\mathop{CH}}\,\] The state of hybridisation of carbons 1, 3 and 5 are in the following sequence

    A)  \[~s{{p}^{2}},sp,\text{ }s{{p}^{3}}\]                       

    B)  \[sp,\text{ }s{{p}^{3}},\text{ }s{{p}^{2}}\]

    C)  \[sp,\text{ }s{{p}^{2}},\text{ }s{{p}^{3}}\]      

    D)  \[s{{p}^{3}},s{{p}^{2}},\text{ }sp\]

    Correct Answer: B

    Solution :

    Key Idea:
    \[-C-C-s{{p}^{3}}\]
    \[-C=C-s{{p}^{2}}\]
    \[-C\equiv C-sp\]
    \[=C\equiv C=sp\]
    \[\underset{6}{\overset{s{{p}^{3}}}{\mathop{C{{H}_{3}}}}}\,-\underset{5}{\overset{s{{p}^{3}}}{\mathop{CH}}}\,=\underset{4}{\overset{s{{p}^{2}}}{\mathop{CH}}}\,-\underset{3}{\overset{s{{p}^{3}}}{\mathop{C{{H}_{2}}}}}\,-\underset{2}{\overset{sp}{\mathop{C}}}\,\equiv \underset{1}{\overset{sp}{\mathop{C}}}\,H\]
    Hence, the state of hybridisation of carbons 1, 3 and 5 are \[sp,\text{ }s{{p}^{3}}\] and \[s{{p}^{2}}\] respectively.


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