The bond between carbon and carbon is absolutely covalent because any element bonded with itself is purely covalent. This is a nonpolar bond. To reassure this we can use an electronegativity table. Carbon's value is 2.2.
2.2 - 2.2 = 0 absolutely covalent bond
The bond between carbon and hydrogen is very covalent.
2.5 - 2.2 = 0.3 very covalent bond.
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